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Q. A proton moves with a speed of 3.10 106 m/s horizontally, at a right angle to a magnetic field. What magnetic field strength is required to just balance the weight of the proton and keep it moving horizontally?

Q. An electric field of 120000 N/C points due west at a certain spot. What is the magnitude of the force that acts on a charge of -7.8C at this spot?

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