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Relativistic Calculations in Electricity and Magnetism

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1. Across what potential difference does an electron have to be accelerated in order to reach the speed v = 9e7 m/s?
Non-relativistically V

Relativistically V

When should you use relativistic calculations?

2. An electron entering Thomson's e/m apparatus (Figure 3.2 and 3.3) has an initial velocity (in horizontal direction only) of 0.7 107 m/s. Lying around the lab is a permanent horseshoe magnet of strength 1.3 10-2 T, which you would like to use.
(a) What electric field will you need in order to produce zero deflection of the electrons as they travel through the apparatus?
(b) When the magnetic field is turned off, but the same electric field remains, how large a deflection will occur if the region of nonzero E and B fields is 2 cm long?

Figure 3.2

Figure 3.3

3. A photon of wavelength 2.2 nm Compton scatters from an electron at an angle of 90°. What is the modified wavelength? (Enter your answer correct to 5 significant figures.)
What is the percentage change, / ?

4. A photon having 27 keV scatters from a free electron at rest. What is the maximum energy that the electron can obtain?

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Solution Summary

This in-depth solution contains step-by-step calculations to determine the potential difference, electric field, deflection, percentage change, and maximum energy. All workings and formulas are shown with brief explanations.

See Also This Related BrainMass Solution

Special Relativity and Schwarzschild Radius

1. A particle is measured to have a kinetic energy that is four times its rest as energy. How fast is the particle moving? Express the speed as a fraction of c.

2. Write down the transformations that relate the electric field E and the magnetic field B in two different inertial frames. Use your result to show that E*B is the same for all inertial observers. You may choose the motion to be in the x-direction if you wish.

3. Define the Schwarzschild radius of a black hole and give a brief description of its significance.

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