The potential difference across a copper wire is 2.0 V when a current of 0.4 A flows through it. The resistance of the wire is:

Correct option is A

Sol: The correct answer is (a) 5.0 Ω

Given:

V= 2.0 V

I = 0.4 A

Formula used:

Ohm's Law

V = I × R

V is the potential difference (in volts), 

I is the current (in amperes), 

R is the resistance (in ohms).

Solution:

Rearranging the formula to solve for

​$$R = \frac{V}{I}$$

$$R = \frac{2.0V}{0.4A}$$

R = 5.0 Ω

So, the resistance of the wire is 5 ohms (Ω)​