# Ohm’s Law States That

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Updated on: September 25th, 2023

Ohm’s law states that-

1. A current flowing through a wire is inversely proportional to its length.
2. A current flowing through a wire is directly proportional to its resistance.
3. The current flowing through a wire is directly proportional to the potential difference applied across its ends.
4. The current flowing through a wire is inversely proportional to the potential difference applied across its ends.

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.

Solution

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

R=ρ.l/A

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.

v∝i

And the constant proportionality of resistor is defined as resistance R.

v=iR

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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