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

Earn 100

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 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 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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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 10

A long straight wire carrying a current of

30 A

is placed in an external uniform magnetic field of induction

4 \times 10^{- 4} T

. The direction of external magnetic field is along the direction of the current. The magnitude of the resultant magnetic induction at a point

2.0 c m

away from the wire is

n \times 10^{- 4} T

. What is the value of

n

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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

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 12

What is the radius of the helix formed when a proton enters a region of uniform magnetic field

B

0.5 T

with velocity

v

at an angle

45 °

with

B

and

P

is the pitch of the helical path?

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JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 13

An electron and a proton enter a region of uniform magnetic field, in a direction at right angles to the field, with the same kinetic energy. They describe a circular paths of radius

r_{e}

and

r_{p}

, respectively. Then,

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 14

A particle with charge $q$ , moving with a momentum $p$ enters a uniform magnetic field normally. The magnetic field has magnitude $B$ and is confined to a region of width $d$ , where $d < \frac{p}{B q},$ The particle is deflected by an angle $θ$ in crossing the field

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An infinitely long hollow conducting cylinder with inner radius R2 and outer radius R carries a uniform current density along its length. The magnitude of the magnetic field, B→ as a function of the radial distance r from the axis, is best represented by:

Important Questions on Magnetic Effects of Current and Magnetism

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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: