How does the magnetic field strength vary while moving from one end of a long so

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1. How does the magnetic field strength vary while moving from one end of a long solenoid to the other, along its interior?

It increases steadily

It decreases steadily

It stays essentially the same

It first increases, then decreases

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Inside a sufficiently long solenoid, away from its very ends, the magnetic field is remarkably uniform along its entire length.