A constant current of 0.1 A is passed through a copper wire by applying potential difference of 3 V across the wire. The resistance of the wire is:

Correct option is D

The correct answer is (D)   ​30 Ω

Given:

V is the potential difference = 3 V

I is the current = 0.1 A 

R is the resistance = ?

Formula used:

By Ohms law   V = I . R

Rearrange the formula: R = $$\frac{V}{I}$$

R = $$\frac{3}{0.1}$$ = 30 Ω

Hence, the resistance is 30 Ω.