question_answer 7)

A horizontal straight wire 10 m long extending from east to west is falling with a speed of , at right angles to the horizontal component of the earth's magnetic field, .                 (a) What is the instantaneous value of the e.m.f. induced in the wire?                 (b) What is the direction of the e.m.f.?                 (c) Which end of the wire is at the higher electrical potential?  

Answer:

(a) Using we get                                             (b) Using Fleming's Right hand rule, the direction of induced e.m.f. is West to East.                 (c) Since the rod will act as a source, the Eastern end will be at higher electrical potential.