Question

Which condition is a limitation of Faraday’s First Law or Neumann’s law?

Options

• Induced emf depends only on whether current flows.

• An open circuit cannot have induced emf.

• No emf is induced whenever the magnetic flux changes.

• No emf is induced if the magnetic flux remains constant.

Answer 1

Neumann’s law applies to changing magnetic flux. If flux remains constant, its rate of change is zero and no emf is induced.