Physics · May / June 2022 · Paper 41 · Question 8
0625
As printed in the paper
The question as text
Fig. 8.1 shows two vertical, cylindrical tubes and a cylindrical magnet all held in a vacuum. copper tube cylindrical magnet plastic tube Fig. 8.1 (not to scale) One tube is made of plastic and the other tube is made of copper. The two cylindrical tubes have identical dimensions. The magnetic field of the small, cylindrical magnet is extremely strong. Initially, the magnet is at rest at the top of the plastic tube. The magnet is released and it falls through the plastic tube without experiencing a resistive force. The magnet takes 0.67 s to fall to the lower end of the plastic tube.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
8(a)[4]
0.27 J
(v =) at (in any form) or 10 × 0.67 or 6.7 (m / s)
C1 6.7 (m / s)
C1 (KE =) ½mv 2 (in any form) or ½ × 0.012 × (10 × 0.67)2
C1 or ½ × 0.012 × 6.72
8(b)(i)[2]
magnetic field / magnetic field lines cut the copper / tube / it (or vv.)
electromagnetic induction occurs or e.m.f. induced
8(b)(ii)[2]
(upwards / opposing) force on magnet
force / magnetic field / e.m.f. / current opposes the change (producing it) / opposes motion or force on magnet due to magnetic field caused by current in tube
Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.