DP Physics (last assessment 2024)

Question 21M.2.HL.TZ1.c.ii

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.2.HL.TZ1.c.ii
Level	HL	Paper	2	Time zone	TZ1
Command term	Show that	Question number	c.ii	Adapted from	N/A

c.ii.

[Maximum mark: 1]

21M.2.HL.TZ1.c.ii

A device sends an impulse of electrical energy to maintain a regular heartbeat in a person. The device is powered by an alternating current (ac) supply connected to a step-up transformer that charges a capacitor of capacitance 30 μF.

The switch is moved to position B.

Show that the charge remaining in the capacitor after a time equal to one time constant $τ$ of the circuit will be 0.37 Q₀.

[1]

Markscheme

$use of Q = Q_{0} e^{- \frac{t}{τ}} to show that 0.37 = \frac{1}{e}$ ✓

Syllabus sections

Additional higher level (AHL)

Additional higher level (AHL) » Topic 11: Electromagnetic induction » 11.3 – Capacitance

Additional higher level (AHL) » Topic 11: Electromagnetic induction

Question 21M.2.HL.TZ1.c.ii

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