Question

O is midpoint of AB. The magnetic field at O is what

Answer 1

Explanation:

the magnetic field O is zero

Answer 2

The magnetic field at O is μ0i/ 2πd

Given: O is the midpoint of AB

To Find: The magnetic field at O is what

Solution:

The magnetic field in the centre of the wire will be zero, but magnetic field lines will point in towards the centre from the left and right, and field lines will point away from the centre up and down.

At O ,

Due to B 1 = μ 0 i 4 π d ,

B1=μ0i4πd

Due to B 2 = μ 0 i 4 π d ,

B2=μ0i4πd

and  B O = B 1 + B 2

               = μ0i /2πd

Therefore, the magnetic field at O is μ0i/ 2πd

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