Question

A straight wire of length 0.5 metre and carrying a current of 1.2 Ampere is placed in a uniform magnetic field of induction 2 T. The force experienced by the wire will be :

• A. 2.4 N
• B. 1.2 N
• C. 3.0 N
• D. 2.0 N

Answer 1

Answer: (B)

1.2 N

$d{F}_{mag}=i(\overrightarrow{dl}\times \overrightarrow{B})$
Since it is a straight line segment,
$F_{mag}=1.2\times 0.5\times 2N=1.2N$