For each of the four experiments shown, choose the option that gives the direction of current through resistor PQ. Note that the wires are not wrapped around the plastic tube in the same way in all cases.
Options

Question

For each of the four experiments shown, choose the option that gives the direction of current through resistor PQ. Note that the wires are not wrapped around the plastic tube in the same way in all cases.

Options

G1 Physics · Accepted Answer

Magnetic flux is Φ=∫B⃗·dA⃗ and induced emf is ε=-dΦ/dt. Apply Lenz’s law for direction and I=ε/R when the circuit is resistive. This gives P to Q P to Q P to Q P to Q.