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)]`

What is the magnitude of a point charge due to which the electric field 30 cm away has the magnitude 2 newton / coulomb ? [1/(4piepsilon_0)=9xx10^9 (Nm^2)/C^2]

The magnitude of point charge due to which the electric field 30 c away has the magnitude 2"N C"^(-1) will be

An infinitely long thin straight wire has uniform linear charge density of (1)/(3) Cm^(-1) . Then the magnitude of the force acting on a charge 3 mu C situated at a point of 18 cm away from the wire is ((1)/(4 pi epsilon_(0))=9 xx 10^(9) Nm^(2)C^(-2))

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))

A cyclinder of radius 5 mm and surface charge density of 2 mu C//m^(2) is surrounded by a medium of dielectric constant 6.28. The magnitude of electric field at a point 2 m away from the axis of the cyclinder is ((1)/(4)piepsi_(0) = 9xx10^(9) Nm^(2)//C^(2))