In Figure $29\mathrm{.}9,$ a bar magnet moves away from the solenoid. The induced current through the resistor R is:

A$)$ from b to a

B$)$ zero

C$)$ from a to b

Figure $29\mathrm{.}10$

In Figure $29\mathrm{.}10,$ a bar is in contact with a pair of parallel rails and is in molion with velocity v$.$ A uniform

magnetic field is present. The induced current through the resistor R is:

A$)$ from b io a$.$

B$)$ from a to b

C$)$ ze$$o

Figure $29\mathrm{.}16$

In Figure $29\mathrm{.}16,$ a long bar slides on two contact points and is in motion with velocity v$.$ A steady, uniform,

magnetic fieid B is present. The induced current through the resistor R is:

A$)$ from a to b

B$)$ zero

C$)$ from b to a

Explain reasoning below

PLEASE EXPLAIN REASONING FOR ALL $3$ SCENARIOS