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The magnetic field of the solenoid is 18.84mT, the number of turns per unit length is 500 turns per metre. Calculate the current if the core is air.

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The magnetic field of the solenoid is 18.84mT, the number of turns per unit length is 500 turns per metre. Calculate the current if the core is air.

(a) 300A

(b) 30A

(c) 3A

(d) 300mA

I have been asked this question in an international level competition.

I'm obligated to ask this question of Magnetic Field of a Solenoid topic in chapter Electromagnetism of Basic Electrical Engineering

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The correct answer is (b) 30A

Explanation: The magnetic field in a solenoid is given by:

B=μnI

Substituting the values in the given values in the equation, I=30A.

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