Two coils C1 and C2 are wrapped around a non conducting cylinder. Coil C1 is connected to a battery and key and C2 with

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Two coils C1 and C2 are wrapped around a non conducting cylinder. Coil C1 is connected to a battery and key and C2 with galvanometer G. On pressing the key (K), current starts flowing in the coil C1 State your observation in the galvanometer:

(i) When key K is pressed on (ii) When current in the coil C1 is switched off.

(iii) When the current is passed continuously through coil C

(iv) Name and state the phenomenon responsible for the above observation. Write the name of the rule that is used to determine the direction of current produced in the phenomena.

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(i) When key K is pressed on then is brief deflection in the galvanometer. The needle of galvanometer instantly jumps to one side and quickly returns to zero.

(ii) When current in the coil C1 is switched off, then there is momentary deflection in the galvanometer. The needle instantly jumps but to the opposite side and quickly returns to zero.

(iii) There is no deflection in the galvanometer when the current is passed continuously through coil C1. When the current is flowing non stop there wont be any change in the magnetic field lines associated with it, thus the galvanometer needle will remain at zero.

(iv) The phenomenon responsible for the above observation is electromagnetic induction.

According to the phenomenon, whenever there is a relative motion between a coil and the magnetic field around it then emf is induced in the coil.

Fleming's right hand rule is used to determine the direction of current.

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(i) When key is pressed on, the galvanometer needle deflects momentarily in one direction.

(ii) When the current in the coil C1 is switched off, the galvanometer needle deflects again

momentarily but in opposite direction to that in the previous case.

(iii) When current is passed continuously through coil C1, no deflection is observed in the galvanometer.

(iv) The phenomenon responsible for the above observations is electromagnetic induction.

Electromagnetic Induction: The process, by which a changing magnetic field in a conductor induces a current in another conductor placed nearby, is called electromagnetic induction.

• Fleming’s right hand rule is used to determine the direction of current produced in the phenomena of electroynagnetic induction.