The current through a circular conducting coil be doubled and the radius be halved then what change of magnetic field takes place in the centre of the coil?

A current of 1 A is flowing through a circular coil of radius 10 cm having N turns. If the magnetic field produced at the centre of the coil be 4pixx10^(-6)T , what is the value of N ?

Due to flow of current I through a square shaped conducting loop, magnetic field generated at its centre is B. the magnetic field generated at the centre of a circular conducting loop having the same perimeter as that of the square and for the flow of the same current is B'. determine the ratio of B to B'.

If we double the radius of a current carrying coil keeping the current unchanged, the magnetic field at its centre will

What is the nature of magnetic field in a moving coil galvanometer?

The radii of two circular coils are 5 cm and 10 cm and their number of turns are 40 and 100, respectively. The coils are coplanar and concentric and a 4 A current is sent through the first coil. Find the current and its direction through the second coil so that the magnetic field at thier centre becomes zero?

A circular conducting coil of radius a and resistance R is placed with its plane perpendicular to a magnetic field. The magnetic field varies with time according to the equation B=B_(0)sinomegat . Obtain the expression for the induced current in the coil.

Two indentical circular coils, P and Q each of radius R, carrying currents 1A and sqrt(3)A resepectively. Are placed concentrically and perpendicular to each other laying in the XY and Yz planes. Find the magnitude and direction of the net magnetic field at the centre of the coils.