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Q.

A point charge q= -8.0 nC is located at the origin. The electric field (in NC-1) vector at the point x = 1.2 m, y = -1.6 m, as shown in figure, is

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a

−14.4i^+10.8j^

b

−14.4i^−10.8j^

c

−10.8i^+14.4j^

d

−10.8i^−14.4j^

answer is C.

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Detailed Solution

E→=14πε0qr2r^r^=r→r=(1.2−0)i^+(−1.6−0)j^(1.2)2+(1.6)2r^=12(1.2i^−1.6j^)E→=9×109×−8×10−922×12(1.2i^−1.6j^)E→=−10.8i^+14.4j^NC−1
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