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(a)Using Ampere's circuital law,obtain t...

(a)Using Ampere's circuital law,obtain the expression for the magnetic field due to a long solenoid at a point inside the solenoid on its axis.
(b)In what respect is a toroid different from a solenoid?Draw and compare the pattern of the magnetic field lines in the two cases.
(c)How is the magnetic field inside a given solenoid made strong?

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