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A partide of unknown charge is fired to the gap between the poles of a magnet, as shown (its pathes in the plane of the scree
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В =-в к ū=v F = -f F = q vXB - fŷ = * q VB (1x (-k)) - fj =- QUB Lixel -fi = + q VB F ]=- q VB fj=6qj ve so, charge will be

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