Electromagnetic Induction MCQ [Free PDF] – 8 Objective Questions with Answers

D — Fleming’s right-hand rule. For generator action, the thumb indicates motion, the first finger the magnetic field and the middle finger induced conventional current.

Faraday's law states that induced EMF is proportional to the time rate of change of flux linkage. Lenz's law supplies the negative sign: the induced current/EMF acts in a direction that opposes the change producing it, consistent with conservation of energy. Key relation: e = −N dΦ/dt.

Exam focus: Magnitude comes from Faraday; direction comes from Lenz. Common trap: Lenz's law says oppose the cause/change, not aid it.

D — Magnetic flux. The induced EMF is proportional to the rate of change of magnetic flux linkage: e = −N dΦ/dt.

A — Electromagnetic induction. Faraday's first law states that an EMF is induced in a circuit whenever the magnetic flux linked with it changes.

Faraday’s law relates induced EMF to the rate of change of flux linkage: e = −N dΦ/dt. The negative sign is Lenz’s law.

B — The direction of induced current reverses. With the field direction unchanged, reversing the conductor's motion reverses the induced EMF and current (Fleming's right-hand rule).

D — The current flowing through the coil. When the coil current changes, its own flux linkage changes and a self-induced EMF (e = −L di/dt) opposes that change.

D — Lenz's law. The direction of the induced EMF is such that its effect opposes the cause producing it.