Question

The electric current existing in a discharge tube is 2.0 μA. How much charge is transferred across a cross-section of the tube in 5 minutes?

Answer 1

Let Q amount of charge be transferred across the cross-section of the tube.
Given:
Current through the discharge tube, I = 2 μA = 2 × 10^–6 A
Time taken to transfer charge, t = 5 mins = 300 s
We know:
Q = It
∴ Q = 2 × 10^–6 × 300 = 6× 10^–4 C