If the inductor coil is rotated very slowly would the ballis

If the inductor coil is rotated very slowly, would the ballistic galvaometer deflection be different from that obtained when the coil is rotated rapidly? Explain

Solution

A galvanometer specially designed to measure the quantity of charge displaced in a current of short duration (such as in the charging or discharging of a capacitor). It can be shown that the deflection of the coil is proportional to the quantity of charge passing through it. It is typically a sensitive moving-coil mirror galvanometer with a coil that has a relatively large moment of inertia and a long period of vibration as compared with a galvanometer designed for current measurement..

The flux density in a magnetic field can be measured using a small flat coil of fine insulated wire with a large number of turns called a search coilor snatch coil. A search coil may be 0.5 cm in diameter and have 500 to 2000 turns. It is mounted on a long insulated handle. Using the coil to determine magnetic flux density involves connecting the coil to a ballistic galvanometer and placing the coil in the field to be measured with the plane of the coil perpendicular to the direction of the flux field., then quickly pulling the coil out of the field to a position where the field intensity is zero and noting the galvanometer reading. As the turns of the coil cut through lines of flux, a transient current is produced causing a galvanometer deflection..

If the inductor coil is rotated very slowly, less no. of flux lines will cut through the coil, less current will be produced and less will be the deflection.

If the inductor coil is rotated rapidly, more no. of flux lines will cut through the coil, more current will be produced and greater will be the deflection.