And this is question 14

Dear Student,

(B) Rheostat-

A rheostat can be used to change the current or the voltage across the current carrying straight conductor around which the patterns of magnetic field lines are studied. Change in voltage or current changes the strength of magnetic field produced by the conductor, which is essential in the study of the produced magnetic field.

 

(A) Voltmeter:

Voltmeter is an instrument which is used to measure voltage.It is always connected in parallel with the circuit.

(C) Plug key:

A plug key works like a switch in a circuit.
 

(D) Battery:

Battery is meant to supply current to drive some apparatus. An arrangement of two or more electric cells from a battery that convert the stored chemical energy into electrical energy. 

Regards

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