Test: Force Determination - Electrical Engineering (EE) MCQ

The correct expression for force in a current carrying conductor in a magnetic field is F=Bil, where B is the magnetic field, i is the current in the conductor and l is the length of the conductor.

The force at right angles to the magnetic field of a current carrying conductor increases when the current increases because it is directly proportional to the force.

The force at right angles to the magnetic field of a current carrying conductor increases when the length of the conductor increases because it is directly proportional to the force.

The force at right angles to the magnetic field of a current carrying conductor increases when the magnetic field intensity increases because it is directly proportional to the force.

The unit foe force in a current carrying conductor is newton because it is a force and the unit of force is newton.

Force is a cross product. A cross product involves the sine of the angle between them. If two quantities are parallel to each other, the angle between them is zero. Sin(0) is zero, hence force is zero.

When a charged particle is undeflected in a field, the magnitude of the magnetic force and electric force acting on the particle is the same, hence the ratio is 1.

The formula for calculating the value of the force which is perpendicular to the electric field is:
F=Bil
Substituting the values from the question, we get F=3kN.

Gravitational force is the weakest of all the forces because its coupling constant is small in value. Gravity cannot be felt in day to day life because of the huge universe surrounding earth. Electromagnetic force is the strongest of all  force as it deals with microscopic particles.

When a conductor carries a certain value of current, the force developed in the conductor, the current in the conductor and the magnetic field in the conductor are mutually perpendicular to each other.