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Question

A horizontal straight wire 10m long extending from east to west is falling with a speed of 5.0 m/s at right angles to the horizontal component of earth's magnetic field 0.3×104 tesla.  The emf induced across the ends of wire is
 


A
1.5 mV with higher potential at eastern end
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B
1.5 mV with higher potential at western end
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C
0.75 mV with higher  potential at eastern end
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D
Zero
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Solution

The correct option is A 1.5 mV with higher potential at eastern end
e=BHlu
=0.3×104×10×5
=15×104
=1.5×103v
= 1.5 mV with higher potential at eastern end 

Physics

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