4.5.5. The d.c. motor
A subsection of Physics, 5054, through 4. Electricity and magnetism
Listing 10 of 48 questions
shows a horizontal, rectangular coil ABCD placed between a magnetic N-pole and an S-pole. There is a current in the coil. D axis A B N S C F An upward force F of size 9.6 × 10–3 N acts on side AB of the coil. Explain why there is a force on side AB. Determine the direction of the current in AB and state how the direction is deduced. Both side AB and side CD of the coil are 2.5 cm from the axis. Determine the total moment acting on the coil. moment = The coil in is part of a direct current (d.c.) motor. State the name of the device that connects the coil of a d.c. motor to the electricity supply. State one change to the arrangement in that produces a greater turning effect in coil ABCD.
5054_w19_qp_22
THEORY
2019
Paper 2, Variant 2
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The diagram shows a relay used to switch on an electric motor. S electric motor primary circuit secondary circuit contacts iron core coil iron armature pivot relay A student makes five statements to explain how the relay switches on the electric motor. The statements are not in the correct order. The current in the coil magnetises the electromagnet. The armature closes the contacts. The current in the secondary circuit makes the motor turn. The electromagnet attracts the iron armature. The switch S in the primary circuit is closed. What is the correct order of the statements?
5054_w22_qp_12
MCQ
2022
Paper 1, Variant 2
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Questions Discovered
48