Two coils are suspended around a central axis as shown in the figure below. One

Question

Two coils are suspended around a central axis as shown in the figure below. One coil is connected to a resistor with ends labeled a and b. The other coil is connected to a battery epsilon. The coils are moving relative to each other as indicated by the velocity vectors v. Use Lenz's law to answer the following question concerning the direction of induced currents and magnetic fields. The direction of the magnetic field in the coil with the battery attached is Al: from right to left ( Bprimary). A2: from left to right (Bprimary ). The direction of the induced magnetic field in the coil with the resistor attached is Bl: from right to left ( Binduced). B2: from left to right (Binduced ). The direction of the induced current in resistor R is Cl: from b through R to a (leftarrow I). C2: from a through R to b (I rightarrow). Choose the appropriate answer.

Explanation / Answer

A1 is correct. Right hand screw rule gives this direction.

B1 is correct. It will try to strengthen the decreasing B by setting up induced B in the same direction.   

C2 is correct. To establish B in right to left direction, the current must be from a to b.

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