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.

E M B I B E

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 60

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IMPORTANT

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Select the curve which is best for making a temporary magnet.

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Important Questions on Magnetic Effects of Current and Magnetism

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 61

Relative permeability of iron is

5500

. Its magnetic susceptibility is

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IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 62

The soft iron (used as core material) has,

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 1

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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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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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 3

In the diagram shown, I₁, I₂ are the magnitude of current in the square loop and infinite long straight conductor respectively. The net magnetic field at the centre of loop is zero, then
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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

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