in the arrangement shown in figure there were two coils wound on a non conducting cylindrical rod initially the key is not inserted.then the key is inserted and later removed.then
Answers
Answer:
According to the question,
We can see that the current in the first coil changes, the magnetic field associated with it also changes.
Therefore, the magnetic field lines around the other coil also change.
Because of it , a momentary deflection in galvanometer will be observed which will end out soon.
Now , because of to similar conclusion, a momentary deflection is again observed in opposite direction when key is removed.
Answer:
Hence, the correct option is (d) there are momentary galvanometer deflections that die out shortly, and the deflections are in opposite directions.
Explanation:
In the above arrangement, whenever an electric current through the first coil is changed, an emf is induced in the coil due to a change in magnetic field lines which pass through the neighboring second coil. When the key is inserted and removed, then the magnetic field lines pass through the second coil increasing and decreasing in two cases respectively. When the key is inserted into the circuit of the first coil, there is a momentary increase in current. This change in current produces a change in the magnetic field, this changing magnetic field induces a current, and a momentary deflection is seen in the circuit of the second coil.
Similarly, when the key is removed, the current becomes zero quickly, and there is a change in the current in the first coil. And, this current change induces a current in the second coil. Therefore, the direction of the current in the two cases is in opposite directions.
Hence, the correct option is (d) there are momentary galvanometer deflections that die out shortly, and the deflections are in opposite directions.
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