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 carrying a large current. large current square card shows the square card viewed from above. card On , draw three magnetic field lines that indicate the direction of the magnetic field and how its strength varies with distance from the wire. The current in the wire increases and the direction of the current is reversed. State how these changes affect the magnetic field. Electricity is transmitted at high voltage. Explain why a high voltage increases the efficiency of transmission even with thinner wires.
0625_m24_qp_42
THEORY
2024
Paper 4, Variant 2
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shows a flexible wire hanging between two magnetic poles. The flexible wire is connected to a 12 V d.c. supply that is switched off. Explain why the wire moves when the supply is switched on. State the direction of the deflection of the wire. When the wire first moves, energy is changed from one form to another. State these two forms of energy. from to wire fixed here wire fixed here 12 V d.c. + N S – flexible wire hanging between magnetic poles shows the flexible wire made into a rigid rectangular coil and mounted on an axle. Add to the diagram an arrangement that will allow current to be fed into the coil whilst allowing the coil to turn continuously. Label the parts you have added. Briefly explain how your arrangement works. axle magnetic pole magnetic pole axle N N S S coil
0625_s05_qp_3
THEORY
2005
Paper 3, Variant 0
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Questions Discovered
188