Using Lena\'s law, determine the direction of current through the galvanometer (

Question

Using Lena's law, determine the direction of current through the galvanometer (left or right) if a) the battery is disconnected from the coil 1 after being connected for several minutes; b) the battery is connected to the corf 1 after being disconnected for several minutes; c) coil 2 is moved towards coil 1 (the battery is connected to the coil 1); d) coil 1 is moved away from coil 2 (the battery is connected to the coil 1); e) the resistance of R is decreased (the battery is connected to the coil 1). Refer to figure 30-19. 4. A small circular ring (see figure) is inside the larger ring that is connected to a battery. Using Lenz's law. determine the direction of current through the smaller ring if a)switch is closed after being open for several minutes; b) switch is open after being closed for several minutes.

Explanation / Answer

3.Figure is missing

4a) we know that from. If an induced current flows, its direction is always such that it will oppose the change which produced it.

when the switch is closed after being open for several minutes.

there is sudden change in the magentic field that will cause a current induced intially in smaller coil.

The direction of the induced current is clockwise.

4b)in this case when switch is open, then there is sudden fall in induced emf in the coil. this change causes the current to be induced in the smaller coil. and the direction of this is also agan Clockwise

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