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1.
A circular ring of diameter 20 cm has a resistance of 0.01
. The charge that will flow through the ring if it is turned from a position perpendicular to a uniform magnetic field of 2.0 T to a position to the field is about
. The charge that will flow through the ring if it is turned from a position perpendicular to a uniform magnetic field of 2.0 T to a position to the field is about
2.
The magnitude of magnetic induction for a current carrying toroid of uniform cross-section is
3.
As shown in the figure, 
and 
are two coaxial conducting loops separated by some distance. When the switch 
is closed, a clockwise current 
flows in (as seen by 
) and an induced current 
flows in . The switch remains closed for a long time. When is opened, a current 
flows in . Then the directions of and (as seen by ) are
and are two coaxial conducting loops separated by some distance. When the switch is closed, a clockwise current flows in (as seen by ) and an induced current flows in . The switch remains closed for a long time. When is opened, a current flows in . Then the directions of and (as seen by ) are
4.
In the circuit shown below, the ac source has voltage 
volts with 
. The amplitude of the current will be nearest to
volts with . The amplitude of the current will be nearest to
5.
A conducting wire is dropped along east-west direction, then
6.
Lenz's law is expressed by the following formula (here 
induced e.m.f., 
magnetic flux in one turn and 
number of turns)
induced e.m.f., magnetic flux in one turn and number of turns)
7.
The average power dissipation in pure inductance is
8.
The current from 
is increasing in magnitude. What is the direction of induced current, if any, in the loop shown in figure.
is increasing in magnitude. What is the direction of induced current, if any, in the loop shown in figure.
9.
The current 
in an induction coil varies with time 
according to the graph shown
in figure. Which of the following graphs shows the induced emf (
) in the coil with time
in an induction coil varies with time according to the graph shownin figure. Which of the following graphs shows the induced emf (
) in the coil with time
10.
A step-down transformer reduces the voltage of a transmission line from 2200 V to 220 V. The power delivered by it is 880 W and its efficiency is 88%. The input current is