In a tangent galvanometer a current of $0.1 \,A $ produces a deflection of $30^o$. The current required to produce a deflection of $60^o$ is......$A$

Which curve may best represent the current deflection in a tangent galvanometer

The ratio of magnetic moments of two bar magnet is $13 : 5$. These magnets are held together in a vibration magnetometer are allowed to oscillate in earth’s magnetic field with like poles together $15$ oscillation per minute are made. What will be the frequency of oscillation of system if unlike poles are together....$oscillations/min$

A long vertical wire in which a current is flowing produces a neutral point with the earth's magnetic field at a distance of $5\, cm$ from the wire. If the horizontal component of the earth's magnetic induction is $0.18\, gauss$, then the curent in the wire is......$A$

The time period of a vibration magnetometer is $T_0$. Its magnet is replaced by another magnet whose moment of inertia is $3$ times and magnetic moment is $1/3$ of the initial magnet. The time period now will be

The magnet of a vibration magnetometer is heated so as to reduce its magnetic moment by $19\%$. By doing this the periodic time of the magnetometer will