An electron moving with velocity v → = i ^ v x enters a uniform magnetic field B → = k ^ B z . The electron experiences

a force but its kinetic energy does not change.

a force and its kinetic energy decreases.

a force and its kinetic energy increases.

no force hence kinetic energy does not change.

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IMPORTANT

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The magnetic field induction at the centre of a current-carrying circular coil (coil 1) and a closed coil (coil 2), shaped as a quarter of a disc is found to be equal in magnitude. If both the coils have equal area, then find the ratio of the currents flowing in coil 2 and coil 1.

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Important Questions on Magnetic Effects of Current and Magnetism

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JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 2

A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is

B .

It is then bent into a circular loop of

n

turns. The magnetic field at the centre of the coil will be

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JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 4

In the figure shown, there are two semicircles of radii $r_{1}$ and $r_{2}$ in which a current $i$ is flowing. The magnetic induction at the Centre $O$ will be

Question Image

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 5

Calculate the magnetic field at the centre of a coil in the form of a square of side

2 a

carrying a current

I

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IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 6

An infinitely long hollow conducting cylinder with inner radius

\frac{R}{2}

and outer radius

R

carries a uniform current density along its length. The magnitude of the magnetic field,

|\vec{B}|

as a function of the radial distance

r

from the axis, is best represented by:

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IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 7

A particle carrying a charge equal to

100

times the charge on an electron is rotating one rotation per second in a circular path of radius

0.8 m

. The value of the magnetic field produced at the centre will be (

μ_{0} =

permeability for vacuum)

HARD

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 8

A circular coil, carrying a constant current

i

is kept in the

x - y

plane. The magnetic flux through the entire

x - y

plane excluding the area of the circular coil is given by

ϕ

and the magnetic flux through the area of the circular coil area is given by

ϕ_{0}

, then

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IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 9

Magnetic lines of force due to a bar magnet do not intersect, because

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JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 11

An electric charge

+ q

moves with velocity

\vec{v} = 3 \hat{i} + 4 \hat{j} + \hat{k}

, in an electromagnetic field given by:

\vec{E} = 3 \hat{i} + \hat{j} + 2 \hat{k}

and

\vec{B} = \hat{i} + \hat{j} - 3 \hat{k}

. The

y -

component of the force experienced by

+ q

The magnetic field induction at the centre of a current-carrying circular coil (coil 1) and a closed coil (coil 2), shaped as a quarter of a disc is found to be equal in magnitude. If both the coils have equal area, then find the ratio of the currents flowing in coil 2 and coil 1.

Important Questions on Magnetic Effects of Current and Magnetism

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