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(a) What is the nature of the magnetic f...

(a) What is the nature of the magnetic field inside a solenoid?
(b) What is the nature of the magnetic field due to a circular coil?

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(a) The magnetic field lines inside a current-carrying solenoid are parallel to its axis.
(b) Near the centre of the coil, the magnetic field lines are nearly straight and parallel. Near the coil, the magnetic field lines are nearly circular and cocentric.
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