MCQs of Moving Charges & Magnetism

Moving Charges & Magnetism MCQs

MCQs of Moving Charges & Magnetism

Showing 1 to 10 out of 123 Questions

At a place an electric field and a magnetic field are in the downward direction. There is an electron moves in the downward direction. Hence this electron _____ .

(a)	will bend towards left
(b)	will bend towards right
(c)	will gain velocity
(d)	will lose velocity.

When a charged particle moves in a magnetic field its kinetic energy _____ .

(a)	remains constant
(b)	can increase
(c)	can decrease
(d)	can increase or decrease

There are 100 turns per cm length in a very long solenoid. It carries a current of 5 A. The magnetic field at its centre on the axis is _____ T.

(a)	3.14 × 10^-2
(b)	6.28 × 10^-2
(c)	9.42 × 10^-2
(d)	12.56 × 10^-2

A conducting wire of 1 m length is used to form a circular loop. If it carries a current of 1 ampere, its magnetic moment will be _____ Am².

(a)	$2 π$
(b)	$\frac{π}{2}$
(c)	$\frac{π}{4}$
(d)	$\frac{1}{4 π}$

A long wire carries a steady current. When it is bent in a circular form, the magnetic field at its centre is B. Now if this wire is bent in circular loop of n turns, what is the magnetic field at its centre ?

(a)	nB
(b)	$n^{2} B$
(c)	2nB
(d)	$2 n^{2} B$

Two parallel thin wires, each carrying current I are kept at a separation r from each other. Hence the magnitude of force per unit length of one wire due to the other wire is _____

(a)	$\frac{μ_{0} I^{2}}{r^{2}}$
(b)	$\frac{μ_{0} I^{2}}{2 π r}$
(c)	$\frac{μ_{0} I}{2 π r}$
(d)	$\frac{μ_{0} I}{2 π r^{2}}$

A particle of charge q and mass m moves on a circular path of radius r in a plane inside and normal to a uniform magnetic field B. The time taken by this particle to complete one revolution is _____ .

(a)	$\frac{2 πmq}{B}$
(b)	$\frac{2 {πq}^{2} B}{m}$
(c)	$\frac{2 πqB}{m}$
(d)	$\frac{2 πm}{Bq}$

At each of the two ends of a rod of length 2r, a particle of mass m and charge q is attached. If this rod is rotated about its centre with angular speed ω, the ratio of its magnetic dipole moment to the total angular momentum of this particle is _____ .

(a)	$\frac{q}{2 m}$
(b)	$\frac{q}{m}$
(c)	$\frac{2 q}{m}$
(d)	$\frac{q}{πm}$

A very long solenoid of length L has n layers. There are N turns in each layer. Diameter of the solenoid is D and it carries current I. The magnetic field at the centre of the solenoid is _____ .

(a)	directly proportional to D
(b)	inversely proportional to D.
(c)	independent of D
(d)	directly proportional to L.

10.

The angular speed of the charged particle is independent of _____ .

(a)	its mass
(b)	its linear speed
(c)	charge of particle
(d)	magnetic field.

Showing 1 to 10 out of 123 Questions