Free Printable Moving Charges and Magnetism

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Moving Charges and Magnetism

Total questions: 15

Worksheet time: 10mins

Name

Class

Date

A circular coil of radius 10 cm is placed in X - Y plane, a constant current of 10 A is flowing in it in clockwise sense. The magnitude and direction of magnetic field at the centre are

2 $\pi$ $\times$ 10^-5 T along z - axis

2 $\pi$ $\times$ 10^-5 T along $-$ z axis

2 $\times$ 10^-5 T along z - axis

2 $\times$ 10^-5 T along $-$ z axis

A constant current I is flowing in a long solid cylindrical rod of radius R. The ratio of magnetic fields at the perpendicular distances R/2 and 3R/2 from the axis of the wire:

3:1

1:3

3:4

4:3

A constant current 10 A is flowing in a long conducting wire, the magnitude of the magnetic field due to the wire at a distance 100 m along the axis of the wire is

4 $\pi\times$ 10^-8 T

2 $\pi\times$ 10^-8 T

2 $\times$ 10^-8 T

A wire is kept along north - south direction and a constant current is flowing in it in north to south direction. What will be the direction of the force on the wire if it is placed in constant magnetic field along west to east direction:

Downwards

Upwards

Along left side

Along right side

Out of miliammeter and an ammeter the -------- is of lesser resistance.

(a)

The resistance of an ideal voltmeter should be ----

(a)

The direction of torque on the coil is along ------ axis.

X - axis

Negative X - axis

Y - axis

Negative Y - axis

The material used in making of the suspension wire used in moving coil galvanometer should be of -------torsional constant and ------- elastic constant.

high, low

high, high

low, low

low, high

A charge particle is moving undeflected in a uniform electric and magnetic fields, now the magnetic field is switched off, the trajectory of the particle will be

circular

helical

straight line

elliptical

10.

The frequency of a charge particle revolving in a perpendicular uniform magnetic field is directly proportional to its velocity as

$v^2$

$\frac{1}{v}$

$\sqrt{v}$

$v^0$

11.

The magnetic field at centre o will be

\frac{5}{12}\frac{\mu_0I}{R}

$\frac{7}{16}\frac{\mu_0I}{R}$

$\frac{3}{7}\frac{\mu_0I}{R}$

$\frac{6}{11}\frac{\mu_0I}{R}$

12.

Torque on a current carrying rectangular coil inside a galvanometer is maximum and constant irrespective of its orientation as it is suspended inside (a) magnetic field.

13.

The ratio of voltage sensitivity ( $V_s$ ) and current sensitivity ( $I_s$ ) of a moving coil galvanometer is (G =conductance)

$\frac{1}{G}$

$\frac{1}{G^2}$

$G$

$G^2$

14.

A wire in the form of a circular loop, of one turn carrying a current, produces magnetic induction B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is

15.

The sensitivity of a moving coil galvanometer can be increased by decreasing

the number of turns in the coil

the area of the coil

the magnetic field

the restoring torque per unit twist of the suspension

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Moving Charges and Magnetism

Total questions: 15

Worksheet time: 10mins

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