Question

A rheostat is used in an electrical circuit

A

to change the resistance of the circuit.

B

to change the potential difference.

C

to change the emf.

D

to change the current through a particular instrument.

Easy
Solution
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Correct option is A)

A rheostat is a variable resistor which is used to control current. they are able to vary the resistance in circuit without interruption. the construction of a rheostat is very similar to potentiometer .Thus A rheostat is used in circuit to change the resistance of the circuit. so option correct is A.

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