At a certain place a magnet makes 30 oscillations per minute. At another place where the magnetic field is doubled, its time period will be

Options

A. `sqrt(2)s`
B. 2s
C. 4s
D. 1//2s

Explanation

The period of magrnet in magnetic field
`T prop (1)/(sqrt(B))`
If magnetic field is doubled,
then `T' prop (1)/(sqrt(2B))`
`rArr " " T' prop (T)/(sqrt(2)) = (2)/(sqrt(2)) = sqrt(2s)`
`["oscillation pet second" = (30)/(60)]`