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If the quantity of charge on each of the two bodies is doubled, the force between them becomes __________. (Twice, Four times, Nine times, Sixteen times)

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Four times
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Don't want to over express myself, just join and feel the experience.

Four times
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Physical Science and Maths Teacher up to Class !2

Four times
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F=k*q1*q2/(r*r) q1->2q1 q2->2q2 F=4*k*q1*q2/(r*r) => Four Times
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B) Four Times
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Mathematics for JEE Mains/Advanced, XI & XII (All Boards)

Four times
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Math Physics Engineering Management

Four times
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A wire 2.5 m long is bent into a square. An current of 100 A flowing through the wire will produce a magnetizing force at the center of the square, equal to a.) 72 AT / m. b.) 144 AT / m. c.) 196 AT / m. d.) 222 AT / m.
Solution: Wire length l=2.5 m; Current i = 100 A; Magnetizing force h = ?. In square, length of each side; 2a = l / 4 ? a = 2.5 / 8 = 0.3125 h= sqrt(2) . i/ ( pi a) =sqrt(2) .100/(pi . 0.3125) =44 AT/m
Kumar Upendra Akshay
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