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E=KQ/r2

Q=Er^2/K

Q=(1)(1)^2/9*10^9

=1.0*10^-10

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12y ago
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11y ago

It will be 9 x 109 x 42 / (1.2)2 Vm-1

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Q: What is the magnitude of the electric field strengh at a Position that is 1.2 m from a point charge of 4.2x10C?
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