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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 earths magnetic field 0.3 ×10^–4 tesla. The emf induced across the ends of wire is

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0.75 mV with higher potential at eastern end

zero

1.5 mV with higher potential at eastern end

1.5 mV with higher potential at western end

answer is A.

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Detailed Solution

Given data:

Length of the wire l=10m

Speed V= 5 m/s

Magnetic field B=0.3×10^-4T

Concept used: induced EMF

Detailed solution:

We know that induced EMF =Blv

Question Image

From Fleming’s right hand rule, the direction of induced EMF is from West to East, so the current will flow from Eastern end to western end.

Thus, the eastern end of the wire will be at higher potential.

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