Electric Field
A point charge of +2 μC creates an electric field. What is the magnitude of the field at a distance of 0.1 m from the charge? (k = 9 × 10⁹ N·m²/C²)
Select the correct option:
Solution
1.8 × 10⁶ N/C
- Definition: The electric field (E) at a point is the force per unit charge at that point.
- Formula: E=kr2q.
- Data:
- q=2×10−6 C.
- r=0.1 m.
- Computation:
- E=(0.1)29×109×2×10−6
- E=0.0118×103.
- Final Value: E=1.8×106 N/C.
- Direction: For a positive charge, the field points radially outward.
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About This Question
- Subject
- physics
- Chapter
- electrostatics
- Topic
- electric field
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
1.8 × 10⁶ N/C
- Definition: The electric field (E) at a point is the force per unit charge at that point.
- Formula: E=kr2q.
- Data:
- q=2×10−6 C.
- r=0.1 m.
- Computation:
- E=(0.1)29×109×2×10−6
- E=0.0118×103.
- Final Value: E=1.8×106 N/C.
- Direction: For a positive charge, the field points radially outward.
This easy difficulty physics question is from the chapter electrostatics, covering the topic of electric field. It appeared in the 2025 exam.
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