An electron of mass 9.1 × 10−31 kg moves horizontally toward the north at 4.5 ×...

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An electron of mass 9.1 × 10−31 kg moves horizontally toward the north at 4.5 ×...

An electron of mass 9.1 × 10−31 kg moves horizontally toward the north at 4.5 × 107 m/s .

Determine the magnitude of a minimum B→ field that will exert a magnetic force that balances the gravitational force that Earth exerts on the electron.

Express your answer to two significant figures and include the appropriate units.

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Answer 1

Answer #1

mg = qvB

9.1 x 10^-31 x 9.8 = 1.6 x 10^-19 x 4.5 x 10⁷ x B

B = 1.239 x 10^-18 T

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Answer 2

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