# Obj-2 HC Verma Magnetic Field due to a Current Solutions Vol-2 Class-12 Ch-35

Obj-2 HC Verma Magnetic Field due to a Current Solutions Vol-2 Class-12 Ch-35 Concept of Physics for Class-12. Step by Step Solutions of Objective -2 (MCQ-2) Questions of Chapter-35 Magnetic Field due to a Current Solutions (Concept of Physics) .Visit official Website CISCE for detail information about ISC Board Class-11 Physics.

## Obj-2 HC Verma Magnetic Field due to a Current Solutions Vol-2 Class-12 Ch-35

 Board ISC and other board Publications Bharti Bhawan Publishers Chapter-35 Magnetic Field due to a Current Solutions Class 12 Vol 2nd writer HC Verma Book Name Concept of Physics Topics Solution of Objective-2 (MCQ-2) Questions Page-Number 249

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Exercise

Magnetic Field due to a Current Solutions Obj-2 (MCQ-2) Questions

### HC Verma Solutions of Ch-35 Vol-2 Concept of Physics for Class-12

(Page-249)

#### Question-1 :-

The magnetic field at the origin due to a current element  idl‾ placed at a position r  is

(a)

(b)

(c)

(d)

The options (a) and (d) are correct

Explanation:

The magnetic field at the origin due to current element idl‾ placed at a position  r‾ is given by

According to the cross product property,

#### Question-2 :-

Consider three quantities . Here, l is the length of a wire, C is a capacitance and R is a resistance. All other symbols have standard meanings.

(a) xy have the same dimensions.
(b) yz have the same dimensions.
(c) zx have the same dimensions.
(d) None of the three pairs have the same dimensions.

The options (a), (b) and (c) are correct

#### Question-3 :-

A long, straight wire carries a current along the z-axis, One can find two points in the xplane such that
(a) the magnetic fields are equal
(b) the directions of the magnetic fields are the same
(c) the magnitudes of the magnetic fields are equal
(d) the field at one point is opposite to that at the other point.

The options (b), (c) and (d) are correct

Explanation:

Consider a current carrying wire lying along x axis.
At any two points on z axis which are at equal distance from the wire, one above the wire and one below the wire, the magnitude of magnetic field will be same and their directions will be opposite to each other.
At any two points on z axis which are at different distances from the wire, one above the wire and other also above the wire, the magnitude of magnetic field will be different and their directions will be same to each other.

#### Question-4 :-

A long, straight wire of radius R carries a current distributed uniformly over its cross section. T he magnitude of the magnetic field is
(a) maximum at the axis of the wire
(b) minimum at the axis of the wire
(c) maximum at the surface of the wire
(d) minimum at the surface of the wire.

The options (b) and  (c) are correct

#### Question-5 :-

A hollow tube is carrying an electric current along its length distributed uniformly over its surface. The magnetic field
(a) increases linearly from the axis to the surface
(b) is constant inside the tube
(c) is zero at the axis
(d) is zero just outside the tube.

The options (b) and  (c) are correct

#### Question-6 :-

In a coaxial, straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zero
(a) outside the cable
(b) inside the inner conductor
(c) inside the outer conductor
(d) in between the tow conductors.

The options (a) and  (b) are correct

#### Question-7 :-

A steady electric current is flowing through a cylindrical conductor.
(a) The electric field at the axis of the conductor is zero.
(b) The magnetic field at the axis of the conductor is zero.
(c) The electric field in the vicinity of the conductor is zero.
(d) The magnetic field in the vicinity of the conductor is zero.

The options (b) and (c) are correct

Explanation:

As the current is following through a conductor so it it is distributed only on the surface of the conductor not in the volume of the cylindrical conductor.

It is equivalent to charge distribution on a cylindrical sheet for which electric field inside a conducting cylindrical sheet is always zero.
Magnetic fields at any point inside the conducting cylinder is proportional to the distance from the axis of the cylinder.
At the axis, r = 0.

This implies that field will be zero at the axis.

—: End of Magnetic Field due to a Current Obj-2 HC Verma (MCQ-2)  Solutions Vol-2 Chapter-35 :–