Answer: The answer you want is
Rectangular shape
Step-by-step 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.