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Ohm’s Law States That
By BYJU'S Exam Prep
Updated on: September 25th, 2023
Ohm’s law states that-
- A current flowing through a wire is inversely proportional to its length.
- A current flowing through a wire is directly proportional to its resistance.
- The current flowing through a wire is directly proportional to the potential difference applied across its ends.
- The current flowing through a wire is inversely proportional to the potential difference applied across its ends.
Table of content
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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