Multiple Choice
Two parallel long wires carry the same current and repel each other with a force F per unit length.If both these currents are doubled and the wire separation tripled, the force per unit length becomes:
A) 2F/9
B) 4F/9
C) 2F/3
D) 4F/3
E) 6F
Correct Answer:

Verified
Correct Answer:
Verified
Q17: The diagrams show three circuits consisting of
Q18: Two parallel wires, 4 cm apart, carry
Q19: Two parallel wires carrying equal currents of
Q20: Two parallel wires, 4 cm apart, carry
Q21: In the figure, the current element <img
Q23: In Ampere's law, <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6585/.jpg" alt="In Ampere's
Q24: Electrons are going around a circle in
Q25: A hollow cylindrical conductor (inner radius =
Q26: A toroid has a square cross section
Q27: The magnitude of the magnetic field