Question

How do magnetic field lines entering and leaving a closed surface contribute to its net magnetic flux?

Options

• As many magnetic field lines enter a closed surface as leave it.

• The number of magnetic field lines entering depends on net electric charge enclosed.

• Magnetic field lines leave a closed surface but do not enter it.

• Magnetic field lines enter a closed surface but do not leave it.

Answer 1

The magnetic flux entering and leaving a closed surface balances exactly. Consequently, the net count—and the net magnetic flux—is zero.