Suppose the induced electromotive force of a double loop wire has a magnitude of when the change in magnetic flux is . How much time has elapsed for the flux change?

A resistor is connected to a coil with turns and a cross sectional area of . A magnet is lowered as shown in the figure. The magnetic field increases from to in . Find the magnitude of the current going through the resistor.

A magnetic rod is inside a coil of wire which is connected to an ammeter. If the rod is stationary, which of the following statements are true?

A system consists of two rails, whose resistance is zero, a conductive bar, whose resistance is also zero, and a resistor whose resistance, 0.02 Ohms. The bar remains in contact with the rails as it slides to the right with a velocity . The distance from one rail to the other is 0.07m. The magnetic field, which is directed out of the page, has a magnitude of 0.0015T. What is the magnitude and direction of current in the resistor?