Answer: Weber.
- A Tesla
- B Weber
- C Henry
- D Ampere-meter
Correct answer: B. Weber
Explanation: Magnetic flux is measured in Weber (Wb). 1 Wb = 1 V x s = 1 T x m<sup>2.</sup>
As a magnet approaches a coil, flux rises steadily and a constant non-zero EMF is induced (Faraday's law). Once the magnet stops moving, flux stays constant and the induced EMF drops to zero - EMF only exists while flux is actively changing.
Concept context
Faraday's and Lenz's laws, motional EMF, self/mutual inductance, eddy currents, and the AC generator - how a changing magnetic flux creates an electric current.