What shape can be drawn though a solenoid to determine the magnitude of its magnetic field? A. triangle B. rectangle C. circle D. trapezoid

The answer you want is

Rectangular shape

Explanation: The shape that can be drawn is a rectangular shape, because when we find the magnitude of the magnetic field, we apply Ampere's circuital law to a rectangular loop.

According to Ampere's circuital law, the magnetic field of a solenoid is directly proportional to the product of the current which is flowing around the solenoid and number of turns per unit line of the solenoid.

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