(i) What is the importance of a radial magnetic field and how is it p

1.	(i) What is the importance of a radial magnetic field and how is it produced ?(ii) Why is it that while using a moving coil galvanometer as a voltmeter a high resistance in series is required whereas in an ammeter a shunt is used ?
Answer» (i) Importance and production of radial magnetic field : In a radial magnetic field, magnetic torque remains maximum everywhere. It is produced due to cylindrical pole pieces and soft iron core. (ii) Voltmeter : A high resistance in series is required when moving coil galvanometer is used as voltmeter to make sure that a low current should travel through voltmeter without changing the potential difference that needs to be measured. Ammeter : A shut is used when a moving coil galvanometer is used as ammeter as to make sure about not much change in total resistance of the circuit with actual current value of flowing current.

(i) What is the importance of a radial magnetic field and how is it produced ?(ii) Why is it that while using a moving coil galvanometer as a voltmeter a high resistance in series is required whereas in an ammeter a shunt is used ?

Answer»

(i) Importance and production of radial magnetic field : In a radial magnetic field, magnetic torque remains maximum everywhere.

It is produced due to cylindrical pole pieces and soft iron core.

(ii) Voltmeter : A high resistance in series is required when moving coil galvanometer is used as voltmeter to make sure that a low current should travel through voltmeter without changing the potential difference that needs to be measured.

Ammeter : A shut is used when a moving coil galvanometer is used as ammeter as to make sure about not much change in total resistance of the circuit with actual current value of flowing current.

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