Question

Two charges +10µC and -20µC are placed 15 cm apart. At what point on the line joining the two charges is the electric potential zero?​

Answer 1

Explanation:

in my case 5 cm from 10uC charge

or 10 cm from -20uC

and the net potential is 0

potential is a vector quantatity so it is simply algebraic sum direction need not to be considered but nature or sign of charge (+,-) need to be considered

Answer 2

Answer:

The correct answer is 45cm apart

Explanation:

Potential at P is V=3×10−84π∈0(x×10−2)+−2×10−84π∈0(15−x)×10−2=0V=3×10-84π∈0(x×10-2)+-2×10-84π∈0(15-x)×10-2=0

∴3x−215−x=0∴3x-215-x=0 , which gives x=9cmx=9cm.

If P lies on extended line OA, the condition for zero electric potential would be 3x−2x−15=03x-2x-15=0,

Which gives x=45cmx=45cm

Hence electric potential is zero at 9 cm and 45 away from positive charge on the side of negative charge.

Potential at infinity is taken zero in the formula used.

The electric potential (additionally called the electrical subject potential, capacity drop, the electrostatic capability) is described as the quantity of work electricity needed to pass a unit of electrical rate from a reference factor to the precise factor in an electric powered subject. extra precisely, it's far the electricity consistent with unit price for a check fee this is so small that the disturbance of the field beneath attention is negligible. furthermore, the motion across the sector is meant to continue with negligible acceleration, that allows you to avoid the check price obtaining kinetic power or generating radiation. by using definition, the electric capacity at the reference factor is zero gadgets. normally, the reference point is earth or a point at infinity, even though any factor may be used.

In classical electrostatics, the electrostatic area is a vector amount that is expressed because the gradient of the electrostatic capacity, that is a scalar amount denoted via V or sometimes φ,identical to the electrical capability power of any charged particle at any region (measured in joules) divided with the aid of the fee of that particle (measured in coulombs). by using dividing out the charge on the particle a quotient is acquired that is a property of the electric discipline itself. In short, an electric powered ability is the electric capacity electricity in step with unit charge.

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