At what orientation does a rotating coil in a uniform magnetic field generate the maximum induced EMF?
Show answer & explanation
Correct answer: D
Explanation
Answer: When the coil’s plane is parallel to the magnetic field lines
Explanation: A rotating coil in a uniform magnetic field generates induced EMF according to Faraday's Law of Electromagnetic Induction. The induced EMF is maximum when the rate of change of magnetic flux is maximum. This happens when the magnetic flux through the coil is zero, which occurs when the coil’s plane is parallel to the magnetic field lines.
Additional Key Facts
Magnetic flux is maximum when the coil’s plane is perpendicular to the field.
Induced EMF is zero when flux is maximum or minimum (turning points).
Maximum EMF occurs when the coil cuts magnetic field lines at the fastest rate.
This principle is used in electric generators and alternators.
The orientation of the coil continuously changes during rotation, producing alternating current.
Potential Exam-Oriented Questions & Answers
Question: When is induced EMF zero in a rotating coil?
Answer: When magnetic flux is maximum or minimum
Question: What type of current is produced by a rotating coil generator?
Answer: Alternating current (AC)