An electron is in a uniform magnetic field B that is directed out of the plane o

Question

An electron is in a uniform magnetic field B that is directed out of the plane of the page, as showIn When the electron is moving in the plane of the page in the direction indicated by the arrow, the force on the electron is directed 1. into the page 2. toward the left 3. out of the page. 4. toward the right 5. toward the bottom of the page. 6. toward the top of the page A proton traveling to the right along the r-axis enters a region where there is a mag- netic field of magnitude 2.2 T directed upward along the y-axis. 19 The charge on a proton is 1.60x10 If the proton experiences a force of 3.5 x 1012 N, find its speed Answer in units of m/s.

Explanation / Answer

1) by right hand rule, toward the bottom of the page

2) Force, F = q v B sin(theta)

velocity, v = (3.5 X 10-12) /(1.6 X 10-19 X 2.2 X sin90°) = 9.94 X 106 m/s

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