The force F → experienced by a particle of charge q moving with velocity v → in magnetic field B is given by F → = q v → × B → . Which pairs of vectors are always right angles to each other?

The vector F → is perpendicular to the plane of v → and B → . Hence the pairs F → and v → ; and F → and B → are always right angles to each other.

In a chamber of uniform magnetic field B → , an electron beam enters with velocity v → . Write the expression for the force experienced by the electron.

F → = − e v → × B → , because the charge on an electrons is - e .

Write the expression for Lorentz magnetic force on the particle of charge ' q ' moving with velocity v → in a magnetic field B → . Show that no work is done by this force on the charged particle.

Lorentz magnetic force, F → = q v → × B → . As the magnetic force F → acts in a direction perpendicular to the direction of the velocity v → or the direction of motion of the charged particle, so work done is zero. W = F → . d s → = F d s cos 90 ° = 0 .

EASY

12th CBSE

IMPORTANT

Earn 100

A current is set up in a long copper pipe. Is there a magnetic field (i) inside (ii) outside the pipe ?

Important Questions on Magnetic Effect of Current

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12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 10

What is the basic difference between magnetic field and electric field ?

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12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 11

The force

\vec{F}

experienced by a particle of charge

q

moving with velocity

\vec{v}

in magnetic field

B

is given by

\vec{F} = q (\vec{v} \times \vec{B})

. Which pairs of vectors are always right angles to each other?

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 12

In a chamber of uniform magnetic field

\vec{B}

, an electron beam enters with velocity

\vec{v}

. Write the expression for the force experienced by the electron.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 13

No force is exerted by a stationary charge when placed in a magnetic field. Why ?

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 14

Write the expression for Lorentz magnetic force on the particle of charge

' q'

moving with velocity

\vec{v}

in a magnetic field

\vec{B}

. Show that no work is done by this force on the charged particle.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 15

A charged particle in a plasma trapped in a 'magnetic bottle' leaks out after a millisecond. What is the total work done by the magnetic field during the time the particle is trapped ?

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 16

A particle of mass

' m'

and charge

' q'

moving with velocity

' v'

enters the region of uniform magnetic field at right angle to the direction of its motion. How does its kinetic energy get affected?

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 17

An electron moving with a velocity of

10^{7} {ms}^{- 1}

enters a uniform magnetic field of

1 T

, along a direction parallel to the field. What would be its trajectory in this field?

A current is set up in a long copper pipe. Is there a magnetic field (i) inside (ii) outside the pipe ?

Important Questions on Magnetic Effect of Current

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