7) A-Ch 23 (2 pts) Two solenoids are close to each other, as shown in the figure

Question

7) A-Ch 23 (2 pts) Two solenoids are close to each other, as shown in the figure, with the switch S open. When the switch is suddenly closed, which way will the induced current flow through the galvanometer in the left-hand solenoid? A) from right to left B) from left to right C) No current is induced 8) A-Ch 23 (2 pts) A coil of wire containing Nturns is in an external magnetic field that is perpendicular to the plane of the coil and it steadily changing. Under these circumstances, an emf is induced in the coil. If the rate of change of the magnetic field and the number of turns in the coil are now doubled (but nothing else changes), eat will be the induced emf in the coil? ?)?/2 B) ?/4 C) D) 4? B) 26 4t

Explanation / Answer

7. B. It will be from left to right (from Lenz's Law, current will be induced such that it opposes the flux induced)

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