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The values of i so that magnetic field a...

The values of `i` so that magnetic field at `R` is zero

A

`1A`

B

`2A`

C

3A

D

4A

Text Solution

Verified by Experts

The correct Answer is:
A

At `R: B_(1)=(mu_(0)(2.5))/(2pi(5))`, downward
`B_(2)=(mu_(0)i)/(2pi(2))`, upward
`B_(R)=0, i.e. B_(1)=B_(2)`
`1/2=i/2 implies i=1 A`
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