IB Physics SL D.3.6 Force between parallel wires
IB Physics SL D.3.6 Force between parallel wires
Practise deciding whether parallel currents attract or repel, and calculating force per unit length from current and wire separation.
How this is tested
- use F/L = mu0I1I2/(2pir) to calculate force per unit length and give the unit N m^-1
- use the current directions on the wire diagram to decide attraction or repulsion and each force direction
- combine the magnetic fields or forces from neighbouring wires to explain a zero net force decision