1.
A proton enters a uniform magnetic field perpendicular to its velocity. The magnetic force acts
2.
The radius of the circular path of a charged particle moving in a uniform magnetic field is directly proportional to
3.
An electron enters a magnetic field with velocity parallel to the field. Its path will be
4.
The magnetic field at the centre of a circular loop carrying current I is
5.
A straight wire carries current out of the plane of paper (•).
6.
The force on a current-carrying conductor is maximum when the angle between current and magnetic field is
7.
A charged particle moving in a magnetic field has constant
8.
Which instrument is based on the force experienced by a current-carrying conductor in a magnetic field?
9.
The time period of revolution of a charged particle in a magnetic field is independent of
10.
The magnetic field inside an ideal long solenoid is
11.
Assertion (A): A magnetic field can change the direction of motion of a charged particle. Reason (R): Magnetic force is always perpendicular to the velocity of the particle.
12.
Assertion (A): Cyclotron cannot accelerate electrons efficiently. Reason (R): The relativistic increase in electron mass changes the cyclotron frequency.
13.
The magnetic field at a point due to a long straight conductor is proportional to
14.
A current-carrying conductor is placed horizontally in a magnetic field directed vertically downward. If current flows towards the east, the conductor experiences force towards
15.
The SI unit of magnetic dipole moment is
16.
Match the Columns Column–I P. Oersted Q. Fleming's Left-Hand Rule R. Solenoid S. Cyclotron Column–II 1. Direction of force 2. Magnetic field similar to bar magnet 3. Discovery of magnetic effect of current 4. Acceleration of charged particles Choose the correct matching.
17.
The torque on a rectangular current loop in a uniform magnetic field is zero when the magnetic moment is
18.
The magnetic force on a moving charged particle is always
19.
The magnetic field produced by a long straight conductor decreases with
20.
Which of the following statements is correct?
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