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Q.

A point charge 25 μC is located in the XY-plane at the point of position vector r0→=i^+j^m. What is the magnitude of electric field at the point of position vector r1→=4i^+5j^m?

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a

900 V/m

b

9 kV/m

c

90 V/m

d

Can't be determined

answer is B.

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Detailed Solution

E= kqr2 wherer= r1→-r0→=4i^+5j^-i^-j^=3i^+4j^= 5 m⇒E=9 x 109 x 25 x 10-65 x 5 =9 x 103 Vm-1=9kVm
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