The magnetic flux through a circuit of resistance R changes by an amount in a time ∆t. Then the total quantity of electric charge Q that passes any point in the circuit during the time ∆t is represented by:
1.
2.
3.
4.
As a result of a change in the magnetic flux linked to the closed-loop shown in the figure, an e.m.f., V volt is induced in the loop. The work done (joules) in taking a charge Q coulomb once along the loop is:
1. QV
2. QV/2
3. 2QV
4. zero