Question
The coil in the d.c. motor in Fig. 9.1 is rotating as shown.
(a) On Fig. 9.1, clearly label the coil. [1]
(b) State two things that could be done to the apparatus shown in Fig. 9.1 in order to make
the coil rotate more rapidly.
1. ……………………………………………………………………………………………………………………..
2. ……………………………………………………………………………………………………………………..[2]
(c) Suggest how the coil could be made to rotate in the opposite direction.
…………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………. [1]
[Total: 4]
Answer/Explanation
Ans: (a) coil clearly and unambiguously indicated
(b) increase strength/power of magnet ignore increase magnetism/ignore add core ignore magnets closer/bigger increase current/voltage/energy from battery }any 2 accept stronger/more powerful battery increase number of turns (in coil) ignore bigger coil ignore rotations
(c) reverse current OR reverse magnet/field however expressed