Question

the work done in turning a magnet of magnetic moment m by an angle of 90 degree from the Mediterranean is N times the corresponding work done to turn it through an angle of 60 degree the value of n is given by​

Answer 1

Q]____?

Explanation:

work done in rotating a dipole from θ1 to θ2 is

W = - MB ( cos θ2 - cos θ1 )

[ M = Magnetic moment

B = Magnetic induction ]

CASE I

W1 = MB ( cos 60° - cos0° ) = MB _[i]

CASE II

W2 = - MB ( cos 60° - cos 0° )

W2 = - MB [ 1/2 - 1 ] = 1/2 MB _[ii]

From Eqs [i] and [ii] W2 = 1/2 W1

As W1 = nW2

∴ n = 2

∴ The value of n is 2 !

Answer 2

Refer to the above attachment .