A metal bar of length 0.4 is pushed at a constant speed of 8.3 m/s through a mag

Question

A metal bar of length 0.4 is pushed at a constant speed of 8.3 m/s through a magnetic field of 0.35 T. The magnetic field is directed out of the page. The bar makes electrical contact with and moves along frictionless metal rods attached to a light bulb of resistance 12 Ohm. Give your reasoning to explain whether the flow of current on the side of the loop containing the bulb is up or down. Determine the magnitude of the induced voltage and the amount of current flowing through the bulb. State very clearly what would happen if the push applied to the bar was removed.

Explanation / Answer

1)

By applying right hand rule

Direction of the flow of current on the side of the loop containing bulb is upwards

2)

EMF is equal to the rate of change of flux through the coil.

EMF is given by E = BVL = 0.35*8.3*0.4 = 1.162 V

now the current in the bulb is E/R = 0.09683333A

3)

If Push apply to the bar was removed then according to lenz law induced emf opposes its cause then the direction of velocity is opposite

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