Question

Please, answer questions #1 and #2 in details and watch significant figures.

1. A coil of wire with an area of 0.025 m2 starts at an angle of 12° with respect to a magnetic field of 1.6 T. The angle changes to 75° in 0.16 s.

a) What is the change in flux?

b) How many loops are needed to produce 16 V of EMF?

c) If the coil of the wire is generally in the plane of this page (from 12° to 75°) and the magnetic field is general pointing into the page in what direction is the current? (Explain your reasoning.)

2. In a fully powered RL circuit, initially charged with an EMF of 1.5 V has a decay time of 4.80 ms. The circuit has a resistance of 80 Ω.

a) How long does it take the current in the circuit to drop from a max of 18.8 mA to 12.0 mA?

b) What is the value of the inductor?

c) If the inductor is a solenoid with an area of 7.07 10-4 m2 and 2500 loops, what is its length?

Answer 1