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Question: 

What magnetic field $B$ is needed to keep 998-GeV protons revolving in a circle of radius 1.0 km? Use the relativistic mass. The proton’s “rest mass” is $0.938 \textrm{ GeV/c}^2$. (1 GeV = $10^9$ eV.) [Hint: In relativity, $m_{rel} v^2/r = qvB$ is still valid in a magnetic field, where $m_{rel} = \gamma m$.]

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$3.3 \textrm{ T}$

Giancoli 7th Edition, Chapter 26, Problem 46

(3:39)

Chapter 26, Problem 46 is solved.

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