Question

The magnetic field at the centre O of given rectangular
frame made of uniform thin wire is

(refer the diagram)​

Answer 1

Answer:

u•i/4√5πa²

Explanation:

We know that magnetic field of reactangle at the centre O is 2u• i/πlb [√l²+b²]

Here i = i

a = a

b = 2a

so , B =2 u•i/ πa*2a [√l²+b²] = u•i /π2a²[√a²+4a²]

= u•i/4πa²*a√5 = u•i / 4√5πa³ Answer