Test: Magnetic Field of a Solenoid - Electrical Engineering (EE) MCQ

The Magnetic field of a solenoid increases when we insert a iron core because, iron is a ferromagnetic material and ferromagnetic materials help in increasing the magnetic property.

When a coin is wound around a steel core, the steel core behaves as a permanent magnet because it is a ferromagnetic material and once it becomes magnetic it does not lose its magnetic property.

The magnetic field due to a solenoid is:
B= μnI, where μ is the permeability, n is the number of turns per unit length and I is the current in the solenoid.

The magnetic field of a solenoid is directly proportional to the number of turns in it. Hence as the number of turns increases, the magnetic field also increases.

The magnetic field of a solenoid is directly proportional to the current in it. Hence as the current increases, the magnetic field also increases.

The magnetic field of a solenoid is inversely proportional to the length. Hence as the length increases, the magnetic field decreases.

There are no magnetic lines of force outside a solenoid, hence the magnetic field outside a solenoid is zero.

The magnetic field in a solenoid is given by:
B=μnI
Substituting the values in the given values in the equation, B=18.84mT.

 The magnetic field in a solenoid is given by:
B=μnI
Substituting the values in the given values in the equation, I=30A.

The magnetic field in a solenoid is given by:
B=μnI
Substituting the values in the given values in the equation n=500 turns/m.