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A train is moving at a rate of 72 km/hr on a horizontal plane. If the earth's horizontal component of magnetic field is 0.345 orested and the angle of dip is 30°, then the potential difference across the two ends of a compartment of length 1.7 m will be-

1.  1.7 V                             

2.  853×10-4 V

3.  85×10-4 V                 

4.  850 μ V