Question

A metallic wire is bent into a square of each side a If the current I is passed through the wire,
what will be the magnetic field at the centre of the square.
​

Answer 1

Answer:

Explanation:

on change of shape, the perimeter remains same

4a=3b -----(1)

Faraday's Law

E=  

Δt

Δϕ

​  

 

Δϕ=BΔA=B(a  

2

−  

2

3

​  

b  

2

 

​  

 

Substitute the value of b in terms of a

Now work done = Powerdeveloped×Δt

=ViΔt=Bia  

2

(1−  

9

4  

3

​  

 

​  

)