Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Current Electricity

Question:

If the length of conductor is increased from l to 2l, what happens to the electrical energy produced in the circuit?

Options:

It doubles

It triples

It quadruples

It remains the same

Correct Answer:

It doubles

Explanation:

Electrical energy : E = I2Rt

Resistance : R = \(\rho \frac{l}{A}\)

E ∝ R ∝ l