Select the best answer for the question.
18. how often does earth's magnetic field change direction?
o a. about every two million years
b. about every four millions years
o c. about every three million years
o d. about every one million years
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Any color picture tube and electric field exerts a net force of magnitude 1.68x 10^-13 n on an electron the rest mass of an electron is 9.11 x 10^-13 what is the electron acceleration?

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