Two concentric coils of wire lie on a horizontal flat surface. The smaller coil
ID: 1301109 • Letter: T
Question
Two concentric coils of wire lie on a horizontal flat surface. The smaller coil is connected to a battery and a switch. The diagram shows the top view of the set up.
(a) Initially the switch is open. What is the direction of the induced current in Coil 2?
clockwise counterclockwise no current
(b) Now the switch is closed. Immediately after the switch is closed, what is the direction of the induced current in Coil 2?
clockwise counterclockwise no current
(c) A long time after the switch is closed, what is the direction of the induced current in Coil 2?
clockwise counterclockwise no current
(d) Now the switch is opened once again. Immediately after the switch is open what is the direction of the induced current in Coil 2?
clockwise counterclockwise no current
Explanation / Answer
a) no current
because no change in magneyic flux
b)counter clockwise
magnetic flux increases in direction into the page so the emf is induced to oppose the change
c) no current
no change in magnetic flux
d0 clockwise
magnetic flux decreases so the emf is induced to keep the flux constant
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