Physics Current Electricity Electric Conduction, Ohm's Law, Electric Current, Potential Deffrence Single Correct MCQ
Published on: September 12, 2026

The lead wires should have

A
Larger diameter and low resistance
B
Smaller diameter and high resistance
C
Smaller diameter and low resistance
D
Larger diameter and high resistance

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Text Solution

Verified by Experts
The correct answer is:
A
Explanation:
In a circuit, lead wires are used to connect various components. Their characteristics can significantly affect the performance of the circuit.
  • Resistance: Lead wires should ideally have low resistance to minimize voltage drops and power losses.
  • Diameter: A larger diameter of the wire decreases its resistance according to the formula:
    $$ R = \frac{\rho L}{A} $$
    where R is resistance, \rho is resistivity, L is the length, and A is the cross-sectional area. A larger cross-sectional area (which is related to a larger diameter) will result in a smaller resistance.

Therefore, lead wires should have a larger diameter and low resistance for efficient operation.
Thus, the correct option is A.

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