Questions
Figure shows a conducting frame having battery and a resistance on which a movable conductor of length 0.5 m can slide. The whole arrangement is placed in a uniform magnetic field of B = 0.4 T directed perpendicular and into the plane of frame. Initially the circuit is open. When the key is inserted, the conductor begins to move. It is found that a force 0.5 N has to be applied on the conductor to the left to keep it moving at constant speed to the right. Current flowing in the conductor is:
detailed solution
Correct option is B
F=Bil⇒i=FBl=0.50.4×0.5=2.5ASimilar Questions
An elasticized conducting band r is around a spherical balloon T (figure). Its plane passes through the center of the balloon. A uniform magnetic field of magnitude 0.04 T is directed perpendicular to the plane of the band. Air is let out of the balloon at 100 cm3s-1 at an instant when the radius of the balloon is 10 cm. The induced emf in the band is
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