NEET Physics: Electric field lines Practice Questions
15 free multiple-choice questions on Electric field lines (Electrostatics) for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. In a uniform electric field, what is the nature of the electric field lines?
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Correct answer: B — They are parallel straight lines
In a uniform field, the field is constant in magnitude and direction everywhere, resulting in parallel straight field lines.
Q2. The density of electric field lines plotted in a region is directly related to which physical quantity?
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Correct answer: C — The magnitude of the electric field
The density of the field lines is proportional to the magnitude of the electric field (E), meaning where lines are closer together, the field is stronger.
Q3. Electric field lines are used to visualize the direction of the electric field. What physical quantity do these lines represent?
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Correct answer: C — Electric Field
Electric field lines represent the direction and magnitude of the electric field at any point in space.
Q4. What property describes the density of electric field lines?
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Correct answer: B — The magnitude of the electric field
The density of the field lines at any point is directly proportional to the magnitude of the electric field (E) at that point.
Q5. Electric field lines originate from which type of charge and terminate on which type of charge?
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Correct answer: C — Positive charge originates, Negative charge terminates
Electric field lines originate (start) from positive charges and terminate (end) on negative charges.
Q6. If two electric field lines are very close together in a specific region, what does this imply about the electric field strength in that region?
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Correct answer: A — The electric field is stronger
The density or closeness of electric field lines indicates the magnitude of the electric field. Closer lines mean a higher field strength.
Q7. When two positive charges are placed far apart, the electric field lines between them flow in which direction?
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Correct answer: A — Along the line joining them
Electric field lines flow from the positive charge (source) to the negative charge (sink). Between two positive charges, the field lines point away from both charges, perpendicular to the line connecting them.
Q8. In an electric field, the direction of the electric field lines is determined by the direction of the force experienced by a positive test charge. What is the physical quantity represented by the density of these electric field lines?
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Correct answer: C — Electric Field Strength
The density of electric field lines is proportional to the magnitude of the electric field (E) at that point. Therefore, the density of field lines is directly related to the electric field strength, which represents the force per unit charge experienced by a test charge.
Q9. In a region where electric field lines are parallel and equally spaced, what can be inferred about the electric field magnitude in that region?
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Correct answer: B — The field is uniform
If field lines are parallel and equally spaced, it signifies that the electric field is uniform throughout that region.
Q10. Field lines behave perpendicular to the surface on which they are drawn. This observation confirms that the electric field lines are always perpendicular to:
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Correct answer: C — The surface
The perpendicularity of the electric field lines to any surface (like a conductor) is a fundamental property of electrostatics.
Q11. What geometric property is fundamentally represented by the direction of an electric field line at any point?
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Correct answer: B — The direction of the electric field vector
The tangent to the electric field line at any point indicates the direction of the electric field vector (E).
Q12. If two electric field lines are drawn very close to each other, what does this indicate about the electric field in that region?
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Correct answer: D — The electric field is very strong
Closely packed field lines indicate a region where the electric field is strong.
Q13. The direction of the electric field vector is indicated by the direction of the electric field lines. This relationship is based on which physical concept?
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Correct answer: A — Force direction
The field lines visually represent the direction of the force that a test charge would experience, which is the direction of the electric field.
Q14. Electric field lines never cross each other because:
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Correct answer: B — The field strength is zero at intersections
If two field lines crossed, it would imply that the direction of the electric field is ambiguous at that point, which is physically impossible.
Q15. If two electric field lines are drawn in a region, and they are parallel to each other, what does this imply about the electric field in that region?
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Correct answer: B — The field is uniform and parallel
Parallel field lines indicate that the magnitude and direction of the electric field are the same everywhere along those lines, implying a uniform field within that parallel region.
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