Question

A current of 0.4 A flows through a wire. How many electrons flow through a cross section of
the wire in one hour?
(Ans. e = 1.6 x 10-¹9 C
diameter? mm carries a steady current of 0.3142 A. Find the magnitude of

Answer 1

9 × 10²¹ electrons flow through a cross section of the wire in one hour.

What is the relation between current and charge?

• Mathematically, current = charge / time
• In S.I. unit, Charge is written in Coulomb and time in second.

What is the amount of charge flown through a wire for one hour if it carries 0.4 A current?

• Charge= current × time
• Current= 0.4 A, time = 1 hour= 3600 s
• Charge= 0.4× 3600

= 1440 C

How many numbers of electrons present in 1440C of charge?

• One electron= 1.6 × 10^(-19) C
• So, 1440 C = 1440/1.6 × 10^(-19)

= 9 × 10²¹ electrons

Thus, we can conclude that the 9 × 10²¹ electrons flow through a cross section of the wire in one hour.

Learn more about current here:

brainly.com/question/25922783

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