Concepts Of Physics MCQ Edition [Volume 2]PhysicsElectric Field and Potential
When a point charge is placed within an electric field, the electric field at a nearby point
Options
- Amay decrease if the charge is negative
- Bwill increase if the charge is positive
- Cwill decrease if the charge is negative
- Dmay increase if the charge is positive
Correct answer
D. may increase if the charge is positive
Step-by-step solution
Let the initial electric field be E ₀ . When a point charge q is placed in this field, it produces its own electric field E _ q . The net electric field at any nearby point is the vector sum of the initial electric field and the electric field due to the point charge: E _ net = E ₀ + E _ q . If q is positive, E _ q is directed radially outward. At points where E _ q and E ₀ are in the same direction, the magnitude of the net electric field increases. At points where they are in opposite directions, the magnitude de