PHYSICS · Multi-part · CBSE · Physics · Current Electricity · Current Electricity
Problem
In a laboratory demonstration, a constant current is maintained in a nichrome heating wire.
• The current is measured to be 0.75 A.
• The current is allowed to flow for exactly 45 s.
(a) Calculate the total charge that moves through a cross-section of the wire during the 45 s interval. Express your answer in coulombs with an appropriate number of significant figures.
(b) Estimate the total number of electrons that pass the cross-section in the same time, stating clearly any physical constants you use in your calculation.
(c) A student claims that doubling the current while keeping the time interval fixed would double the number of electrons that pass the cross-section. Evaluate this claim and justify your reasoning quantitatively.