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Due to electric effects on the earth and in the atmosphere, there is an electric field near the earth's surface that points down. Assuming the electric field is uniform with a magnitude of 150 N/C, what charge would a 145g baseball need to float as though it were weightless?

I am quite confused by what formula I need to apply to this, and what condition it needs to meet. The ball needs to acquire enough charge to overcome a 150 N/C electric field....but how to represent that numerically as one side of an equation?

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  1. force gravity=electric force
    q= 9.8*massball/E=
    so q= ...

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