Question

photocell connected in an electrical circuit is placed at a distance D from a source of light as a result current I flows in the circuit what will be the current in the circuit when the distance is reduced to D/2​

Answer 1

Answer:

9I ...not sure

Explanation:

Answer 2

Given :

Distance between photocell and the source = D/2

To find :

The current flowing in the circuit = ?

Solution :

• The current flowing in the circuit due to photo electric source is given by

          i = P/4πr2

• In the first case distance is D

            i =P/4πD²

• In the second case distance id D/2

            i₁=P/4π(D/2)²

            i₁=4P / 4πD²

            i₁=4i

The current flowing in the circuit becomes 4 times the initial current