H2P-422

Deflection of charged beams

H2 Physics · JC 2 · Hard · Deflection of charged beams

In a velocity selector, charged particles pass through perpendicular electric and magnetic fields and move undeflected. The electric field strength is

4.0\times10^3\,\text{V m}^{-1}

and the magnetic flux density is

0.20\,\text{T}

. What is the speed of the particles that pass straight through?

$2.0\times10^4\,\text{m s}^{-1}$
$8.0\times10^2\,\text{m s}^{-1}$
$5.0\times10^2\,\text{m s}^{-1}$
$8.0\times10^4\,\text{m s}^{-1}$

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