6) A teacher used the equipment shown in Figure 6 to demonstrate the motor effect.
6.1) Describe how Fleming’s left-hand rule can be used to determine the direction in which the rod will move when the switch is closed, and state the direction.
6.2) Increasing the current can increase the force acting on the copper rod.
Give one other way in which the size of the force acting on the copper rod could be
increased. [1 mark]
6.3) The copper rod in Figure 6 has a length of 7 cm and a mass of 4 ×10–4 kg.
When there is a current of 1.12 A the resultant force on the copper rod is 0 N.
Calculate the magnetic flux density.
Gravitational field strength = 9.8 N/kg