Electric Resistance and Ohm’s Law Nootan Solutions, Nageen Prakashan

Electric Resistance and Ohm’s Law Nootan Solutions, ISC Class-12 Physics Nageen Prakashan Chapter-5 Solved Numericals. Step by step Solutions of Kumar and Mittal ISC Physics Class-12 Nageen Prakashan Numerical’s Questions. Visit official Website CISCE for detail information about ISC Board Class-12 Physics.

Electric Resistance and Ohm’s Law Nootan Solutions, ISC Class-12 Physics Nageen Prakashan Chapter-5 Solved Numericals of Kumar and Mittal

 

Class: 12
Subject: Physics
Chapter 3:

Electric Resistance and Ohm’s Law

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Board ISC
Writer /Publications Nootan / Nageen Prakashan/Kumar and Mittal
Topics Solved Numericals of page 221,222,223,224

 


Definition of Electrical Conductivity

It is the inverse of specific resistance for a conductor whereas the specific resistance is the resistance of unit cube of the material of the conductor.

SI Unit of Conductivity: 

The SI unit of conductivity is mhom-1

Electrical Conductivity

When a conducting substance is brought under the influence of an electric field  ,free charges (e.g. free electrons in metals) move under the influence of this field in such a manner, that the current density  due to their motion is proportional to the applied electric field.

Significance of Ohm’s Law: 

Ohm’s law is obeyed by many substances, but it is not a fundamental law of nature. It fails if

  1. V depends on I non- linearly. Example is when ρ increases with I (even if the temperature is kept fixed).
  2. The relation between V and I depends on the sign of V for the same absolute value of V.
  3. The relation between V and I is non- unique. For e.g., GaAs

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Kirchhoff’s First Rule:

At any junction of several circuit elements, the sum of currents entering the junction must be equal the sum of currents leaving it.

In the above junction, current I enters it and currents I1 and I2 leave it. Then, I = I1 + I2.
This is a consequence of charge conservation and assumption that currents are steady, that is no charge piles up at the junction.

Kirchhoff’s Second Rule:

The algebraic sum of changes in potential around any closed resistor loop must be zero. This is based on the principle that electrostatic forces alone cannot do any work in a closed loop, since this work is equal to the potential difference, which is zero, if we start at one point of the loop and come back to it.


Nageen Prakashan Chapter-5 Solved Numericals of Electric Resistance and Ohm’s Law Nootan Solutions Kumar and Mittal, ISC Class-12 Physics 

( Page – 221 )

Question 1

A current ………………….the wire .

Answer

Ans 1 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 2

A current ………………………..conductor

(i)………………………

(ii)……………………….

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Answer

Ans 2 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal


( Page – 222 )

Question 3

The cross ………………the wire ?

Answer

Ans 3 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 4

90 C ……………………the wire .

Answer

Ans 4 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 5

Estimate ………………………numbers …………

Answer

Ans 5 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 6

Calculate …………….. cross section ……………..

Answer

Ans 6 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 7

A 3.0 m …………………………..copper is …………..

Answer

Ans 7 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 8

Find out …………………….applied on it .

Answer

Ans 8 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 9

A very …………………..conductance ?

Answer

Ans 9 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 10

What length ………………………10 ohms ?

Answer

Ans 10 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 11

The specific …………………cross section .

Answer

Ans 11 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 12

A piece ………………………respectively .

Answer

Ans 12 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 13

A thick ……………………………resistance .

Answer

Ans 13 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 14

A wire …………..new wire .

Answer

Ans 14 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 15

A 1 kg ……………these wires .

Answer

Ans 15 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 16

Two coppers …………………….wire B .

Answer

Ans 16 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 17

Two wires ………………respectively .

Answer

Ans 17 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal-compressed

Question 18

A 200 V ………………………..filament .

Answer

Ans 18 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 19

A rectangular ……………………………..temperature ………

Answer

Ans 19 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal-compressedAns 21 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 20

Two wires ………………………materials ?

Answer

Ans 20 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 21

A 100 …………………….the Bulb .

Answer

Ans 21 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 22

The maximum ………………….maximum current .

Answer

Ans 22 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 23

How much ………………………..minute ?

Answer

Ans 23 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 24

Compute  the …………………….20 ohms ..

Answer

Ans 24 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 25

A heating …………… the element .

Answer

Ans 25 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 26

An electric ……………….the motors .

Answer

Ans 26 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 27

An electric  ……………………….the press .

Answer

Ans 27 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 28

A current …………….. wire ?

Answer

Ans 28 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 29

A bulb ………………filament ?

Answer

Ans 29 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 30

Find the …………………… supply line .

Answer

Ans 30 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal


( Page – 223 )

Question 31

Find the ……………..filament .

Answer

Ans 31 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 32

Find the ……………..filament .

Answer

Ans 32 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 33

A lamp illumination . find

(i)………………………

(ii)……………………….

(iii)……………………….

Answer

Ans 33 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 34

In a ……………..operating .

(i)………………………

(ii)……………………….

(iii)……………………….

Answer

Ans 34 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 35

We have …………….for it .

Answer

Ans 35 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 36

Two cities …………..the wires .

Answer

Ans 36 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 37

A 500 watt ………………liberated .

Answer

Ans 37 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 38

An electric ………………….its element .

Answer

Ans 38 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 39

Calculate ……………….glowing .

Answer

Ans 39 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 40

Two bulbs ……………the bulbs .

Answer

Ans 40 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 41

Two resistor ………………….resistor R2 .

Answer

Ans 41 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 42

A 60 watts …………….. become 120/(48 +6 ) A .

Answer

Ans 42 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal-compressed

Question 43

How can …………………….4 ohms .

Answer

Ans 43 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 44

Join three ……………2 ohms .

Answer

Ans 44 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 45

A 5 ohms ……………….find n .

Answer

Ans 45 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 46

Three resistor ………….find .

(a)………………………

(b)……………………….

Answer

Ans 46 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 47

Three resistor ………….find .

(a)………………………

(b)……………………….

(c)…………………

Answer

Ans 47 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal-compressed

Question 48

A 150 ohms …………………mains .

Answer

Ans 48 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 49

An arc ………………same current .

Answer

Ans 49 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 50

A filament ………………supply .

Answer

Ans 50 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 51

Each of ………………..of them ?

Answer

Ans 51 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal


( Page – 224 )

Question 52

Three resistors …………………..A and B .

Answer

Ans 52 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 53

Four resistors ……………………..corners .

Answer

Ans 53 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 54

Calculate …………………resistors .

Answer

Ans 54 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal-compressed

Question 55

Calculate …………………resistors .

Answer

Ans 55 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal-compressed

Question 56

A wire …………………..it read ?

Answer

Ans 56 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal-compressed

Question 57

The resistance …………………of silver ?

Answer

Ans 57 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 58

The resistance ……………………temperature .

Answer

Ans 58 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal-compressed

Question 59

A heating ……………………….involved is .

Answer

Ans 59 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal-compressed

Question 60

The resistance ………………….carbon is ……………

Answer

Ans 60 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

Question 61

A metallic …………………..its material .

Answer

Ans 61 Electric Resistance and Ohm's Law Nootan Solutions, Nageen Prakashan Kumar and Mittal

— End of Electric Resistance and Ohm’s Law Numericals :–


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