A coil of wire, or solenoid, consists of a wire coiled up into a spiral shape. When an electric current flows, the shape of the magnetic field is very similar to the field of a bar magnet. The ...

Equipment: A compass, iron filings, a current carrying solenoid and a 40 Amp power supply. What it does: The compass shows the direction of the field lines in and around the solenoid. The iron filings ...

It’s time for another physics example. In this case, I am going to calculate the electric field due to an electric charged rod. Of course you could do this analytically using a bit of calculus.