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# When a bar magnet is pushed towards ( or away ) from the coil connected to a galvanometer, the pointer in the galvanometer deflects. Identify the phenomenon causing this deflection and write the factors on which the amount and direction of the deflected depends. State the laws describing this phenomenon.

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#### The phenomenon involved is electromagnetic induction (EMI). For the deflection amount depends upon the speed of movement of the magnet or rate of change of flux. Direction depends on the sense ( towards or away) of the movement of the magnet Direction of deflection is according to Lenz's law.The law describing the phenomenon is:The magnitude of the induced emf in a circuit is equal to the rate of change of the magnetic flux through the circuit.$$\varepsilon =-\dfrac{d\varphi_B}{dt}$$

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Q1
When a bar magnet is pushed towards ( or away ) from the coil connected to a galvanometer, the pointer in the galvanometer deflects. Identify the phenomenon causing this deflection and write the factors on which the amount and direction of the deflected depends. State the laws describing this phenomenon.
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Q2
(a)The pointer in the galvanometer deflects, when a bar magnet pushed or away from the coil connected to a galvanometer. Identify the phenomenon causing this deflection and write the factors on which the amount and direction of the deflection depends. State the laws describing this phenomenon.
(b) Sketch the change in flux, emf and force when a conducting rod PQ of resistance R and length l moves freely to and fro between A and C with speed v on a rectangular conductor placed in uniform magnetic field as shown in the figure.

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Q3

A coil made of insulated copper wire is connected to a galvanometer. What will happen to the deflection of the galvanometer if this coil is moved towards a stationary bar magnet and then moved away from it? Give reason for your answer and name the phenomenon involved.

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Q4

A coil is connected to a galvanometer. When the N-pole of a magnet is pushed into the coil, the galvanometer deflected to the right. What deflection, if any is observed, when:

ii) when the S-pole is inserted?

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Q5

A coil is connected to a galvanometer. When the N-pole of a magnet is pushed into the coil the galvanometer deflected to the right . What deflection, if any, is observed when :

(a) the N-pole is removed ?

(b) the S-pole is inserted ?

(c) the magnet is at rest in the coil ?

State three ways of increasing the deflection on the galvanometer.

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