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Q.

A uniformly charged rod of length 4m and linear charge density λ= 30µC/m 1s placed as shown in figure.Calculate the x-component of electric field at point P.

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a

1.8 x 103 N/C

b

36 x 105 N/C

c

9 x 105 N/C

d

27 x 105 N/C

answer is A.

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Detailed Solution

As we know

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Ex=kλdcosθ2-cosθ1, Ey=kλdsinθ2+sinθ1 Here, θ1=tan-143=53o and θ2=90o So, Ex=kλd(1-cos53o)=9 x 109 x 30 x 10-6 36 x 10-2 =36 x 105 N/C

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