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Magnetic fields (A-level only)

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Question 47

An alpha particle (4He2+^{4}\text{He}^{2+}4He2+) is moving at a speed vvv perpendicular to a uniform magnetic field of flux density BBB. It follows a circular path of radius RRR.

A helium-3 ion (3He+^{3}\text{He}^{+}3He+) is projected into the same magnetic field at a speed of 4v4v4v perpendicular to the field.

Assuming the mass of a nucleon is mmm and the elementary charge is eee, what is the radius of the path of the helium-3 ion?

A

32R\frac{3}{2}R23​R

B

3R3R3R

C

6R6R6R

D

12R12R12R

Markscheme

Magnetic fields (A-level only) Questions

  1. A Level
  2. /Physics
  3. /Magnetic fields (A-level only)

66 exam-style questions on AQA A Level Physics Magnetic fields (A-level only), covering Magnetic flux density (A-level only), Moving charges in a magnetic field (A-level only), Magnetic flux and flux linkage (A-level only), Electromagnetic induction (A-level only), Alternating currents (A-level only), and The operation of a transformer (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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