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Objective Questions:

1. When current is parallel to magnetic field, then force experience by the current
carrying conductor placed in uniform magnetic field is
(a) Twice to that when angle is 60°
(b) Thrice to that when angle is 60°
(c) zero
(d) infinite
2. Which of the following factors affect the strength of force experience by a current
carrying conduct in a uniform magnetic field?
(a) magnetic field strength
(b) magnitude of current in a conductor
(c) length of the conductor within magnetic field
(d) All of above.
3. Assertion: When the direction of velocity of moving charge is perpendicular to the
magnetic field, it experience a maximum force.
4. Reason: Force on the moving charge does not depends on the direction
magnetic field in which it moves.
5. A positive charge is moving upwards in a magnetic field directed towards north.
The particle will be deflected towards
(a) west
(b) north
(c) south
(d) east

Subjective Questions:

1. What happens if a current carrying conductor is placed in the magnetic field?
2. What is the magnetic force due to a current carrying conductor placed in
uniform magnetic field
3. How is a current carrying wire placed in a magnetic field so that magnetic field
does not act on it?
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4. An α-particle of mass 6.65 × 10 kg and charge twice that of an electron but
of positive sign travels at right angles to a magnetic field with a speed of 6 ×
5
-1
10 ms . The strength of the magnetic field is 0.2 T. Calculate the force on
the α-particle.
5. suppose that in a physics lab you rub a glass rod with silk, placing a 20-nC
positive charge on it. Calculate the force on the rod due to the Earth’s
magnetic field, if you throw it with a horizontal velocity of 10 m/s .

6. When would a current carrying conductor kept in the magnetic field
experience maximum force?