Ferrofluids are useful in electronics because they:

  1. can be held in place and moved by magnetic fields
  2. conduct heat poorly
  3. emit light
  4. are solid
Answer

A) can be held in place and moved by magnetic fields

Controllable liquid. SLO P-09-E-09 · Understanding

Physics MCQ · More Magnetism and Electromagnetic Induction MCQs · Practise