in verification of Ohm's law rheostat is used in the circuit what is its function

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Dear Student,
In verification of Ohm's law rheostat is used to provide variable resistance.It results in varying of potential difference and current in the circuit and shows that the current is directly proportional to the potenial difference.
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From observation table the resistance in circuit is

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in verification of Ohm's law rheostat is used in the circuit what is its function

Dear Student, In verification of Ohm's law rheostat is used to provide variable resistance.It results in varying of potential difference and current in the circuit and shows that the current is directly proportional to the potenial difference. Regards

Dear Student,
In verification of Ohm's law rheostat is used to provide variable resistance.It results in varying of potential difference and current in the circuit and shows that the current is directly proportional to the potenial difference.
Regards