iGCSE Physics (0625) 4.5.5 The d.c. motor Paper 4-2023,2024&2025

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

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