Answer:
B'= 3.333 B
Explanation:
Lets take
Initial area = A
Magnetic field = B
The area after compression
A'=0.3 A
Magnetic field = B'
We know that flux ,Ф
Ф = B A
Given that flux is constant so
B A = B' A'
B A=B' x 0.3 A
B'= 3.333 B
It means that magnetic field will increase.
Answer:
3.33
Explanation:
We are given that
Magnetic flux of loop of wire=[tex]\phi[/tex]
Let original area of loop of wire=A
Initial magnetic field produced in wire= B
We have to find the change in magnetic when area is reduced by 0.3 its original value.
We know that magnetic flux
[tex]\phi=BAcos\theta[/tex]
When area is reduced by 0.3
[tex]A'=0.3 A[/tex]
[tex]\phi'=0.3 B'A cos\theta[/tex]
[tex]\phi'=\phi[/tex]
[tex]0.3 B'A cos\theta= BA cos\theta[/tex]
[tex] B'=\frac{B}{0.3}=3.33 B[/tex]
When area is reduced to 0.3 its original value then magnetic field is 3.33 times the initial value.Therefore, the magnetic field increases.
