Home › Karnataka PUC II › Physics › Electromagnetic Induction › Faraday's law of electromagnetic induction state…
Faraday's law of electromagnetic induction states that the induced emf around a closed circuit equals
AThe magnetic flux through the circuit
BThe rate of change of magnetic flux through the circuit, with a negative sign
CThe total current in the circuit
DThe resistance of the circuit
Answer & Solution
Correct answer: B. The rate of change of magnetic flux through the circuit, with a negative sign
ε = − dΦ_B/dt. The minus sign embeds Lenz's law (opposing change). The magnitude depends only on how fast flux changes, not flux itself.
Related questions
The coil of an AC generator connects to the outside circuit through:A coil is labelled 2 H. The H stands for the unit called the:A magnet dropped through an aluminium pipe, compared with a PVC pipe, takes:Some trains brake with electromagnets held above the rails. The braking feels:Cutting slots in the swinging copper plate makes it:A copper plate swings between the poles of a magnet and soon stops. The cause is:A loop moves while lying fully inside a uniform magnetic field. The induced current is:Where does the work you do pushing the magnet into the coil end up?