The equation for magnetic flux is given by, ΦB=BAcosθΦB=BAcosθ. Given the following scenarios, state whether the magnetic field B, area A, or orientation is changing.
(a) Pushing and pulling a magnet near a coil.
(b) Stretching the coil.
(c) Rotating the coil a few degrees with respect to a horizontal axis.
(d) Rotating the magnet.
(e) Turning on and off a switch of a circuit successively.