Magnetic fields (A-level only)

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Question 48

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

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

Assuming the mass of a nucleon is $m$ and the elementary charge is $e$ , what is the radius of the path of the helium-3 ion?

$32R\frac{3}{2}R$

$3 R$

$6 R$

$12 R$

Magnetic fields (A-level only) Questions

A Level
Physics
Magnetic fields (A-level only)

A Level
Physics AQA
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