Time period of oscillation of a magnetic needle is

Options

A. `T = sqrt ((T)/( MB))`
B. `T = 2pi sqrt((I)/( MB))`
C. `T = 2pi sqrt (( MB)/( I ))`
D. `T = pi sqrt (( MB)/( I ))`

Answer

B

Explanation

Time period of oscillation of a magnetic needle is `T = 2pi sqrt ((I )/( MB))`