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The answer for Q.2 IS B-Maximum C-Minimum
Explanation:
B is maximum since it is present on the coil whereas c is minimum since it is outside the coil.
Q3. 1) When key K is pressed there will be slight fluctuation in needle of galvanometer because magnetic field is disrupted.
2) Similarly when current is switched off there will be slight fluctuation in needle of galvanometer in the opposite direction due to magnetic field being disrupted.
3) When current is continuously passed there will be no fluctuation in needle of galvanometer since magnetic field will not be disrupted.
4)This phenomenon is electromagnetism. The rule used to is right hand thumb rule.
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