Select the correct answer.
a) When `'n'` identical magnets are arranged in the form of closed polygon with unlike poles nearer, the resultant magnetic moment is zero.
b) If one magnet is removed from the polygon, the resultant magnetic moment becomes `'M'`.
c) If one magnet is reversed in the polygon, the resultant magnetic moment of combination becomes `2M`

Options

A. a, b and c are correct
B. a and b are correct but c is wrong
C. only a is correct
D. a, b and c are worng

Answer

A