Find the magnitude of the magnetic force on the segment CD of length `30cm` placed in a magnetic field of `0*3T` and a current of `4A` flows through it as shown in figure.

Answer

`0*31N`

Explanation

Here, `l=30cm=0*30m`, `B=0*3T`, `I=4A`,
`theta=180^@-120^@=60^@`
Force, `F=IBlsintheta=4xx0*3xx0*3xxsin60^@`
`=4xx0*3xx0*3xxsqrt3//2=0*31N`