David Sang and Darrell Hamilton Solutions for Chapter: Electromagnetic Forces, Exercise 1: Exercise 20.1

State and explain what happens when the switch $\text{'}X\text{'}$in the circuit shown is closed?

Describe an experiment to establish the shape of the magnetic field around a long straight wire.

Sketch the magnetic field around a solenoid, carrying a current. Label the direction of the current and the direction of the field lines.

Sketch the magnetic field around a solenoid, carrying a current. Label the direction of the current and the direction of the field lines.

Describe an experiment to verify this experimentally.

A $10 \mathrm{m}$ length of wire has a current of $5 \mathrm{A}$flowing through it. It is then coiled tightly into a solenoid. State how the magnetic field strength

would compare in the two situations at equal distance from each?

Describe the effect on the magnetic field around a solenoid of increasing the current flowing through the solenoid.

Show that the polarity of the solenoid could be reversed.