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प्रश्न
How do magnetic field lines entering and leaving a closed surface contribute to its net magnetic flux?
विकल्प
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.
MCQ
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उत्तर
The magnetic flux entering and leaving a closed surface balances exactly. Consequently, the net count—and the net magnetic flux—is zero.
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