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     EduGorilla 
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    Two equal metal balls are charged to 10 and – 20 units of electricity. Then they are brought in contact with each other, later separated to the original distance. The ratio of magnitudes of the force between the two balls before and after contact is

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    1. 8 : 1
    2. 1 : 8
    3. 2 : 1
    4. 1 : 2
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