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Electric fields is one of those chapters where students either score very high or lose marks due to small conceptual mistakes.
The good news? Most exam questions follow predictable patterns.
If you understand how to approach them step-by-step, you can solve almost any question confidently.
In this guide, we’ll break down:
Think of an electric field like an invisible influence zone around a charged object.
Just like a magnet affects iron without touching it, a charged object affects another charge without contact.
E = F / q
| Concept | Meaning | Unit |
|---|---|---|
| Electric Field | Region where a charge feels force | - |
| Electric Field Intensity | Force per unit charge | N/C |
| Direction | Same as force on positive charge | - |
Formula
E = kQ / r²
| Situation | Electric Field |
|---|---|
| Near charge | Strong field |
| Far from charge | Weak field |
| Property | Explanation |
|---|---|
| Start from + charge | End at – charge |
| Never intersect | One point has one direction |
| Denser lines | Stronger field |
An electric dipole consists of two equal and opposite charges separated by a small distance.
Formula
p = q × 2a
| Question Type | Approach |
|---|---|
| Definition | Write definition and draw diagram |
| Numerical | Use formula |
| Direction | From negative to positive |
| Position | Formula Trend | Strength |
|---|---|---|
| Axial | 1 / r³ | Strong |
| Equatorial | 1 / r³ | Weaker |
τ = pE sinθ
| Angle | Torque |
|---|---|
| 0° | 0 |
| 90° | Maximum |
| 180° | 0 |
Φ = Q / ε₀
Electric flux depends only on the charge enclosed inside a surface.
| Mistake | Correct Approach |
|---|---|
| Wrong formula | Identify question type |
| Unit errors | Convert to SI units |
| Ignoring direction | Always mention direction |
| Skipping steps | Write full solution |
F = qE
| Distance | Field Strength |
|---|---|
| Double | 1/4 |
| Triple | 1/9 |
| Topic | Formula |
|---|---|
| Electric Field | E = F/q |
| Point Charge | E = kQ/r² |
| Dipole Moment | p = q × 2a |
| Torque | τ = pE sinθ |
| Force | F = qE |
| Gauss Law | Φ = Q/ε₀ |
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Electric fields is a pattern-based chapter. With the right approach, you can easily score full marks.
If you want to practice this topic, you can take a quiz in Curious Corner for better practice.
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