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7. An air-filled long solenoid has a turn density of 1000 turns/m, a radius of
1.50 cm and carries a current of 0.0700 A that is increasing at a rate of 1.50 A/s.
(a) Find the magnitude of the magnetic field inside the solenoid.
(b) Find the induced electric field at a point 0.500 cm from the solenoid axis.
(c) Determine the magnitude of the Poynting vector at this location.

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