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A wire carrying a current of 3A is bent ...

A wire carrying a current of `3A` is bent in the form of a parabola `y^2=4-x` as shown in figure, where `x` and `y` are in metre. The wire is placed in a uniform magnetic field `B=5hatk` tesla. The force acting on the wire is

A

`60hatiN`

B

`-60hatiN`

C

`30hatiN`

D

`-30hatiN`

Text Solution

Verified by Experts

The correct Answer is:
A
At `x=0`

`y=+-2m`
`F_(MNP)=F_(MP)=i[MPxxB]`
`=3[(4hatj)xx(5hatk)]`
`=60hati`
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