Question

Magnetic field at the centre of a circuilar coil using clasp rule

Answer 1

Magnet field at the centre of a loop or coil= (4×pi×10^-7)×N×i/2r
where n is number of turns in the loop or coil.
i is the current and r is the radius of coil

To find the direction of magnetic field we use the right hand thumb rule:
We assume that we hold the conductor by our right hand such that our thumb points the direction of current. Then the direction of magnetic field will be along the fingers encircling the conductor.

This is how we can figure out the magnetic field and the direction of magnetic field at the centre of a coil.

Hope this helps:)