Two parallel beams of electrons are moving in the same direction. Does they repel or attract each other?

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Explain how many femtometers are in a nanometer?

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The most abundant metal in the atmosphere?

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Explain about Barometer?

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Explain the Positive Acceleration ?

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is the below statement correct. the force of attraction of earth on a man, who is inside the artificial satellite is zero

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Explain what is an electron?

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Explain the balanced field takeoff?

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why velocities of x rays and gamma rays are same inspite they have different wavelengths and frequencies

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Explain about Gases ?

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laser is an acronym for light amplification by

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With the formula Frequency=(np)/120 were does the 120 come from I realize it to be a constant but how was it determined

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