Question

A current of 3 A 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 30${}^o$ with the direction of the field. It experiences a force of magnitude

• A. $3\times {10}^{-4}N$
• B. $3\times {10}^{-2}N$
• C. $3\times {10}^{2}N$
• D. $3\times {10}^{4}N$

Answer 1

The correct option is B $3\times {10}^{-2}N$

$F=ILBsin\theta$
$=3\times 0.40\times (500\times {10}^{-4})\times sin{30}^o$
$=3\times {10}^{-2}N$