Question

Which of the following statements regarding magnetic lines of force is correct?

• A. Total magnetic flux linked with a closed surface is always zero
• B. They need not be perpendicular to the surface from where they start of whre they meet
• C. They may or may not pass through a conductor
• D. All of these

Answer 1

The correct option is A Total magnetic flux linked with a closed surface is always zero

Solution:

We use here the properties of magnetic field lines

which state that

• the no. of magnetic field lines enters in closed surface is equal to

the no. of magnetic field lines comes out to the surface.So, flux linked

with a closed surface is always zero. option A is correct

• another property is, magnetic field lines are

always $\perp$ to surface from where they start and where they end.

option B is not correct

• also magnetic field lines pass through conductor always.

option C is not correct

and hence,

The correct opt : A