Two fixed point charges +4uC and +1uc are separated by 30cm in air. Find the position between them at which the resultant electric field is zero or find the neutral point.
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the position at which the the resultant electric field is zero is 10 cm.
- let a be the distance of the position from +1uC and (30-a) be the distance from the +4uC.
- the electric field at this position due to both +1uC and +4uC are equal.
Therefore
on Simplifying,
The neutral point is at 10 cm.
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