Question:

i.

Suppose you install a compass on the centre of a car's dashboard. (a) Assuming the dashboard is made mostly of plastic, compute an order-of-magnitude estimate for the magnetic eld at this location produced by the current when you switch on the car's headlights. (Suppose you have two 110-W headlights running in series from a 12-V battery with all the current going through the switch 55 cm from the compass. Model the current as being from a long straight wire.) 0 101 T O 10-3 T O 10*6 T O 109 T O 1012T (b) How does this estimate compare with the Earth's magnetic field? A certain superconducting magnet, built to be used as a mass separator in nuclear physics experiments is shown in the figure below. It is in the form of a solenoid of length 0.500 m and can generate a magnetic eld of 9.35 T in its core when its coils carry a current of 75.1 A. Find the number of turns in the solenoid