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1. A constant current I is maintained in a solenoid. Which of the following quantities will not increase if an iron rod is inserted in the solenoid along its axis?
A. Magnetic field at the centre.
B. Self-inductance of the solenoid.
C. Magnetic flux linked with the solenoid.
D. Rate of joule heating.
3. The expression for the magnetic flux
A. A
B. B
C. C
D. D
4. A magnet is moved towards the coil (a) quickly and (b) slowly, and then the work done is
A. does not depend on the motion of the magnet.
B. smaller in case (a)
C. equal in both cases
D. larger in case (a)
5. A cylindrical bar magnet is held along the axis of a circular conducting loop. Which one of the following movements of the bar magnet will not induce a current in the loop?
A. The magnet is rotated about its own axis.
B. The magnet is moved along its length.
C. The magnet is rotated about an axis passing through its mid point and perpendicular to its length.
D. The magnet is rotated about an axis through one end and perpendicular to its length.
7. The total number of magnetic lines of force crossing a surface normally is termed as
A. Magnetic field.
B. Magnetic permeability.
C. Magnetic flux.
D. Magnetic susceptibility.
9. A coil of area 10 cm² of 20 turns is placed in uniform magnetic field of 104 gauss. The normal to the plane of the coil makes an angle of 60° with the magnetic field. The flux in maxwell through the coil is
A. 105
B. 106
C. 103
D. 104
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