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Q.

A 10  cm  long conductor is in uniform magnetic field of 20 mT  at an angle of 300  to the field direction and 5 A  current is flowing through it, the force acting on the conductor is

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a

1 mN

b

2 mN

c

4 mN

d

5 mN

answer is D.

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Detailed Solution

Magnetic length 2l=10 cm=10×10−2 m Magnetic field B=20 mT=20×10−3 T Current i=5 A Angle θ=300 F=Bil sinθ    =20×10−3×5×10×10−2×sin30    =5×10−3N ∴  F=5 mN
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A 10  cm  long conductor is in uniform magnetic field of 20 mT  at an angle of 300  to the field direction and 5 A  current is flowing through it, the force acting on the conductor is