A charge of 0.04C is moving in a magnetic field of 0.02T with a velocity 10m/s in a direction making an angle 30o with the direction of field. The force acting on it will be :
4×10−3N
zero
8×10−3N
2×10−3N
A
4×10−3N
B
8×10−3N
C
2×10−3N
D
zero
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Solution
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Force on the moving charge is, →F=q(→v×→B)=qvBsinθ=0.04×10×0.02sin30o=0.04×10×0.02×0.5=4×10−3N
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