4.2.2. Electric current
A subsection of Physics, 0625, through 4. Electricity and magnetism
Listing 10 of 72 questions
Describe, in terms of particles and the terminals of the battery, the movement of charge in an electric circuit. shows a lightning flash between a cloud and the ground beneath. cloud lightning flash ground The charge built up on the cloud before the lightning flash is 0.60 C. This charge is completely transferred to the ground by the lightning flash in 5.0 × 10–5 s (0.000050 s). Calculate the current between the cloud and the ground. current = The potential difference (p.d.) between the cloud and the ground during the lightning flash is 2.5 × 108 V. Calculate the energy transferred during the lightning flash. energy = Suggest what happens to the energy calculated in .
0625_m17_qp_42
THEORY
2017
Paper 4, Variant 2
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represents two identical metal plates, positioned horizontally, one above the other in a vacuum. A negative charge of 0.000 000 042 C (4.2 × 10−8 C) is transferred to the upper plate, leaving the lower plate with a positive charge of the same size. On , draw the pattern of the electric field between the two plates and indicate the direction of the lines of force. A conducting copper wire is used to connect the two plates and this leaves the plates uncharged. Charge flows in the wire for 0.000 000 035 s (3.5 × 10−8 s). Calculate the average current in the wire during this time. current = State, in terms of its atomic structure, why the copper wire is an electrical conductor.
0625_s14_qp_33
THEORY
2014
Paper 3, Variant 3
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Questions Discovered
72