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 tesla. If the magnetic field is perpendicular to the length of the wire, the force acting on the wire is:

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

Answer 1

The correct option is B 1.2 N

$F=Bilsin\theta$ ,Here $\theta ={90}^0$
$F=2\times 1\cdot 2\times 0\cdot 5$
$F=1\cdot 2N$