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Question

The next three questions relate to this scenario.

An electron has mass m=9.1x10^-31 kg and charge q = 1.6x10^-19 C. In an experiment at Oak Ridge National Laboratory, an electron is accelerated from rest by moving through the electric field between two charged plates that have a potential difference of 1500 Volts. The electron then enters a space that contains a uniform magnetic field. The magnetic field has a strength of 0.3 Tesla and points out of the page.

-When the electron enters the region with the magnetic field, the force on it is directed

a) toward the top of the page

b) toward the bottom of the page

c) into the page

d) out of the page

—When the electron is in the magnetic field region, its speed v

a) stays the same

b) increase

c) decreases

—How much time t does the electron spend in the magnetic field region?

Answer 1

Answer to both parts is (a)

First part is based on Lorentz force and in in Lorentz law speed of charged particle in magnetic filed does not change