Very large currents in power-station busbars require strong supports because:

  1. the bars are heavy only
  2. they are magnetic materials
  3. the forces between the conductors can be large
  4. of thermal expansion only
Answer

C) the forces between the conductors can be large

Mutual forces. SLO P-09-E-37 · Understanding

Physics MCQ · More Magnetism and Electromagnetic Induction MCQs · Practise