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4.5.3. Magnetic effect of a current
A subsection of Physics, 0625, through 4. Electricity and magnetism
Listing 10 of 188 questions
shows a wire that carries a current into the page. The circles on show the pattern of the magnetic field around the wire. On , draw an arrow on each circle to show the direction of the magnetic field. State why the spacing of the circles increases as the distance from the wire increases. shows an electric door lock. The slot in the door contains an unmagnetised iron bolt attached to a spring. The slot in the door frame is empty. This slot is surrounded by the coils of a solenoid. In the door is unlocked. The spring is not stretched. door door frame solenoid spring unmagnetised iron bolt S In the door is locked. The spring is now stretched. The bolt is initially in the position shown in . Describe and explain what happens when the switch S is closed, the switch S is reopened.
0625_w17_qp_42
THEORY
2017
Paper 4, Variant 2
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The diagram shows a horizontal wire between the two magnetic poles of a U-shaped magnet. The U-shaped magnet is on a balance. When the switch closed, the reading on the balance decreases. 125.20 g 123.49 g switch open magnetic poles switch closed magnetic poles The experiment is carried out three more times with the following changes made. Only the current is reversed. Only the magnetic field is reversed. Both the current and the magnetic field are reversed at the same time. Which changes cause an increase in the reading on the balance?
0625_w18_qp_12
MCQ
2018
Paper 1, Variant 2
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Questions Discovered
188