When the thickness of the wire in the circuit changes, R and I will also change, but V will remain constant. Option C is correct.
What is ohm’s law?
Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.
When all physical parameters and temperature are constant,Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.
This current-voltage connection may be expressed mathematically by Ohm's law as;
[tex]\rm V = IR \\\\\ \rm R= \frac{V}{I}[/tex]
Resistance is inversely proportional to the current.When the thickness of the wire in the circuit changes, R and I will also change, but V will remain constant.
Hence, option C is correct.
To learn more about the ohm's law, refer to the link;
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