KEAM 2016 Physics and Chemistry Paper

Period of oscillation =T Time-period of magnet executing oscillation
T=2π√‌

1

MB

where, I=Ml of magnet about an axis passing through its centre and perpendicular to plane of the magnet
M= magnetic moment
B= magnetic field Whenthe brass piece is placed, the new time period,
T′=2π√‌

1

MB

So, the time-period remains the same T=T′
Frequency. f′=‌

1

T′

=‌

1

T