Answer: C. The current flowing through a wire is directly proportional to the potential difference applied across its ends.
Ohm's law states that the current flowing through a wire is directly proportional to the potential difference applied across its ends.
Materials, in general, have a characteristic behavior of resisting flow of charge through them, this characteristic behavior of a material is known as resistance of the material and is denoted by the symbol ‘R’. resistance of a material with uniform cross-sectional area A depends on cross-sectional area A of the material and its length l, which is given by below mathematical formulae
Here ρ = resistivity of the material
Ohm’s law states that, the potential difference across a resistor is directly proportional to the current flowing through it, provided all physical conditions and temperature remain constant.
And the constant proportionality of resistor is defined as resistance R.
Here R is the physical property of the material which will change if the external conditions are altered.
And ohms law holds true until external conditions of resistor are unchanged.
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