Magnetic Fields

Example 4
Two long, straight, parallel wires are 3.00 cm apart. I1 = 3.00 A and
I2 = 5.00 A in opposite directions.
(a) Find B field strength at point P
(b) At what point, besides infinity, is the B field strength zero?
P

Fields due to coil and solenoid

Field due to wires in solenoid

Magnetic fields due to permanent magnet
Iron filings scattered near short bar magnet
Field lines due to solenoid (long coil of wire carrying current)

Earth’s magnetic field

Circular Path of charge moving perpendicularly to B field
Therefore:

Velocity selector

Mass spectrometer

Cathode Ray Oscilloscope

Cathode Ray Oscilloscope

Time-base voltage