GEOLOGY

Detailed explanation-1: -Galvanometer is the device which is used for measuring small currents due to changing magnetic field.

Detailed explanation-2: -galvanometer, instrument for measuring a small electrical current or a function of the current by deflection of a moving coil. The deflection is a mechanical rotation derived from forces resulting from the current.

Detailed explanation-3: -Galvanometer is used to detect small current changes. By adding resistors, it can be converted into an ammeter or a voltmeter. Potentiometer is used to measure resistance of a resistor or voltage of a battery.

Detailed explanation-4: -Small currents can also be measured by current integration. Two methods are used for collecting charges on a known capacitor and measuring the voltage. The first uses an electrometer as a voltmeter with a capacitor shunting the input. The second incorporates the capacitor into the feedback of the electrometer.

Detailed explanation-5: -An ammeter is inserted to measure the current in the circuit. The current is then measured using one of several techniques that generally rely on the magnetic field generated by a current. One example of this is the moving coil method. This is the method used by galvanometers.