Revision: ADVANCED PHYSICS – Magnetic Fields

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Advanced Physics: Magnetic Fields - Revision Quiz

Test your understanding of Advanced Physics: Magnetic Fields here:

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1) An electron moves in a circular orbit perpendicular to a uniform magnetic field. A second electron is also moving in a circular orbit in the same magnetic field with twice the radius.

How do the period of revolution and the speed of the second electron compare with those of the first?

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2) The diagrams show different particle beams entering a region between two metal plates in which there are uniform electric and magnetic fields.

In which arrangement would it be possible for the beam to pass through undeflected?

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3) A charge Q is travelling with speed v in a magnetic field B. At one instant in time, its velocity is at an angle θ to the horizontal as shown.

What is the magnetic force acting on it at this instant in time?

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4) P and Q are two ions with masses mP and mQ respectively. They have the same charge q and the work done on both charges after passing through an applied p.d. of V is qV. Subsequently, P and Q enter a magnetic field B.

The radius of the path of ions P and Q is rP and rQ respectively. What is the ratio of rQ / rP?

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5) A particle of mass m and charge +q enters with speed v at right angles to a magnetic field B. The particle arrives at point P, a distance d from the slit as shown in the diagram below.

Which of the following is a correct expression for d?

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