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Question 22M.2.HL.TZ1.c.ii

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Date May 2022 Marks available [Maximum mark: 3] Reference code 22M.2.HL.TZ1.c.ii
Level HL Paper 2 Time zone TZ1
Command term Determine Question number c.ii Adapted from N/A
c.ii.
[Maximum mark: 3]
22M.2.HL.TZ1.c.ii

Two capacitors C1 and C2 of capacitance 28 µF and 22 µF respectively are connected in a circuit with a two-way switch and a cell of emf 1.5 V with a negligible internal resistance. The capacitors are initially uncharged. The switch is then connected to position A.

A cell is now connected by a switch to a coil X. A second coil Y of cross-sectional area 6.4 cm2 with 5 turns is looped around coil X and connected to an ideal voltmeter.

The graph shows the variation with t of the magnetic flux density B in coil Y.

Determine the average emf induced across coil Y in the first 3.0 ms.

[3]

Markscheme

attempted use of ε=∆Φ∆t OR NA∆B∆t ✓

ε=5×7.5×10-3×6.4×10-43×10-3 ✓

8.0 «mV» ✓

Examiners report

This question was well approached with most candidates recognizing that this was a Faraday's law question. Many made an attempt to use the correct equation, but common errors were choosing incorrect values from the graph and incorrectly converting the given area. Examiners were generous with ECF for candidates who clearly showed work leading to an incorrect result.

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