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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