21.For a short magnet placed along the arms of deflection magnetometer in TanA position

22.If the reduction factor of a tangent galvanometer is 900mA, then the current that produces a deflection of 30° in it is

23.The circular compass box of a tangent galvanometer has graduations

24.In tangent galvanometer experiment, the plane of the coil should be adjusted to be along the

25.The magnetic needle of a tangent galvanometer is kept small because the magnetic field is