4.1. Simple magnetism and magnetic fields
A subsection of Physics, 5054, through 4. Electricity and magnetism
Listing 10 of 115 questions
A student moves a metal bar upwards between the poles of a magnet, as shown in . N S A direction of movement metal bar The ammeter connected to the metal bar shows a small positive reading as the bar moves. Explain why there is a reading on the ammeter. Complete Table 6.1 by stating what the ammeter shows when the metal bar moves in the direction shown by the arrow in each diagram. Table 6.1 reading shown on the ammeter A S N S A N S A N The student finds that using a stronger magnet increases the reading on the ammeter. State one other way in which the student can produce a larger reading on the ammeter, using the same rod. Describe how Lenz’s law applies when the bar is moved upwards.
5054_s21_qp_21
THEORY
2021
Paper 2, Variant 1
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EITHER shows a solenoid connected to an ammeter. N S A permanent magnet The S-pole of a permanent magnet moves into the left-hand end of the solenoid. The ammeter reading shows that there is a small positive current in the circuit. Explain why there is a current in the circuit when the magnet moves. When the magnet is inside the solenoid, it stops moving. It is then pulled back out of the solenoid. Explain what happens to the ammeter reading as the magnet moves out of the left-hand end of the solenoid. OR shows the symbol for a logic gate and its truth table. output input input input output State the name of the logic gate shown in . shows two of these logic gates connected to make a bistable circuit. X Y P Q Terminals P and Q each have the logic level 0. Terminal X has the logic level 1. Explain why terminal Y has the logic level 0. Terminal P is briefly connected to a supply of logic level 1. State the effect of this on the logic level of terminal X and the logic level of terminal Y. Terminal P returns to logic level 0 again. State the effect of this return to value 0 on the logic level of terminal X and on the logic level of terminal Y. State how this circuit exhibits the property of memory.
5054_w21_qp_21
THEORY
2021
Paper 2, Variant 1
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Questions Discovered
115