Electric Resistance and Ohm’s Law Numerical-I Class-12 Nootan ISC Physics Ch-5. Step by step solutions of Kumar and Mittal Physics of Nageen Prakashan as council latest prescribe guideline for upcoming exam. Visit official Website CISCE for detail information about ISC Board Class-12 Physics.
Electric Resistance and Ohm’s Law Numerical-I Class-12 Nootan ISC Physics
| Board | ISC |
| Class | 12 |
| Subject | Physics |
| Book | Nootan |
| Chapter-5 | Electric Resistance and Ohm’s Law |
| Topics | Numericals on Electric Current and Current Density |
| Academic Session | 2025-2026 |
Numericals on Electric Current and Current Density
Que-1. A current of 20 µA flows in a wire for 30 seconds. Find the amount of charge and the number of free electrons transferred through the wire.
Ans-1 Given – Current (I) = 20 μA = 20 × 10-6 A and time (t) = 30 sec
The charge transferred through the wire is
⇒ Q = It
⇒ Q = 20 × 10^-6 × 30 = 6 × 10^-4 C
So, number of electron,
n = Q/qe
= 0.6/1.6 x 10^-19
= 3.75 x 10^15.
— : End of Numericals on Electric Current and Current Density. :–
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