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Q.

The electric field due to an infinitely long, thin, uniformly charged rod with a charge density of 0.3 $μ C / m$ at a distance 20cm from the rod. is $x \frac{kN}{C} .$ what is the value of $x$ ?

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answer is 27.

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Detailed Solution

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$\vec{E} = \frac{2 λ}{4 π ε_{0} r} \overset{\land}{r} = \frac{2 \times 9 \times 10^{9} \times 0.3 \times 10^{- 6}}{20 \times 10^{- 2}} \overset{\land}{r} = (2.7 \times 10^{4} N / C) \overset{\land}{r}$

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The electric field due to an infinitely long, thin, uniformly charged rod with a charge density of 0.3 μC/m at a distance 20cm from the rod. is xkNC. what is the value of x?