The frequency of oscillations of a small magnet in a magnetic field of induction `2.4xx10^-4 Wb//m^2` is n. If the frequency of oscillations of same magnet becomes`n/4. What is the value of new magnetic field ?

Explanation

`n=1/(2pi)sqrt((MB)/1)`
`thereforen_1/n_2=sqrt(B_1/B_2)`
`n/(n//4)=sqrt(B_1/B_2)`
`therefore 4^2=B_1/B_2.`