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What is the magnitude of a point charge ...

What is the magnitude of a point charge due to which the electric field `30cm` away the magnitude `2`?
`[1//4 pi epsilon_(0)=9xx10^(9)Nm^(2)//C^(2)]`

A

`2 xx 10^(-11) C`

B

`3 xx 10^(-11) C`

C

`5 xx 10^(-11) C`

D

`9 xx 10^(-11) C`

Text Solution

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The correct Answer is:
A
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An infinite number of electric charges each equal to 5 nano-coulomb (magnitude) are placed along X -axis at x=1 cm, x=2 cm,x=8cm ……and so on. In the setup if the consecutive charges have opposite sign, then the electrical field in Newton/Coulomb at x=0 is (1/(4piepsilon_(0))= 9xx10^(9)N-m^(2)//C^(2))

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