3 A of current is flowing in a linear conductor having a length of 40 cm. The conductor is placed in a magnetic field of strength 500 gauss and makes an angle of 30∘ with the direction of the field. It experiences a force of magnitude
A
3×104N.
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B
3×102N.
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C
3×10−2N.
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D
3×10−4N.
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Solution
The correct option is C3×10−2N. By using F=Bilsinθ⇒F=(500×10−4)×3×0.4×sin30∘=3×10−2N.