A flat circular coil has 80 turns of diameter 20 cm with a total resistance of 40 ohm. The plane of the coil is perpendicular to
a uniform field. At what rate should the field change for the thermal power dissipated in the coil to be 2W?
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Explanation:
no of turns = 80
radius = 10 CM
resistance = 40 ohm
the plane of coil is perpendicular to field so the force is maximum
power = 2 W
P = V2
__
R
2= v2
__
40
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