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  • (a) 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 deflec

(a) 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 deflection depends. State the laws describing this phenomenön.
(b) Sketch the change in flux, emf and force when a conducting rod PQ of resistance R and length I 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.

 

 

 

 
 
 
 
 

Answers (1)

(a) \rightarrow Electromagnetic induction is the phenomenon causing the deflection

\rightarrow The magnitude of deflection depends on the velocity of movement and direction depends on whether the magnet is moved away or towards the coil.

\rightarrow Faraday's law describes this phenomenon whenever the magnetic flux linked with a conductor changes an emf is induced in the conductor.

(b)For forward motion flux linked with the circuit

=Blx\; \; \; O\leq x< b

=Blb\; \; \; b\leq x< 2b

Induced emf

\varepsilon =-Blv\; \; \; O\leq x< b

    =O\; \; b\leq x< 2b

I=\frac{Blv}{r}\rightarrow Inward

F=\frac{B^{2}l^{2}v}{r}\; \; \; \; \; 0\leq x< b

     =O\; \; \; \; \; \; \; b\leq x< db

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Safeer PP

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