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In Fig. the electric field lines on the ...

In Fig. the electric field lines on the left have twice the separation of those on the right. (a) If the magnitude of the field at A is 60 N/C, what is the magnitude of the force on a protorn at A? (b) What is the magnitude of the field at B?

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(a) `9.6 xx 10^(-18)N`, (b) 30 N/C
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