What is the peak emf generated by rotating a 1000-turn, 20.0 cm diameter coil in the Earth’s 5.00×10−5 T magnetic field, given the plane of the coil is originally perpendicular to the Earth’s field and is rotated to be parallel to the field in 10.0 ms?

4. A square circuit has 2 m sides and is perpendicular to a uniform magnetic field, with half the area of the loop in the field, as shown. The loop contains a 9 V voltage source. The magnitude of the magnetic field varies with time, with B = 6 + 5t, where B is the field strength in teslas and t is the time in seconds. (a) Determine the value of the induced emf in the circuit. (b) Which way does the overall current flow in the circuit, clockwise or counter-clockwise? Or is the current zero? Explain why your answer is correct.

2. An AC generator has 75 rectangular loops on its armature. Each loop is 14.0 cm long and 10.0 cm wide. The armature rotates at 1300 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.700 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator? Volts

14. A wire is oriented into a loop that has a diameter of 1 cm. This loop is then pulled closed in 0.5 s. If there was a magnetic field directed through the loop of 0.25 T, what emf is induced?