Question

Calculate the power of a material with electric field 100 units at a distance of 10cm with a current of 2A flowing through it.

(a) 10

(b) 20

(c) 40

(d) 80

I have been asked this question during an online exam.

The origin of the question is Real Time Applications topic in chapter Electrostatic Fields of Electromagnetic Theory

Answer 1

Correct answer is (b) 20

Best explanation: Power is defined as the product of voltage and current.

P = V X I, where V = E X d. Thus P = E X d X I = 100 X 0.1 X 2 = 20 units.