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NEET & JEE · Physics · Class 12

Electrostatic Potential and Capacitance — NEET & JEE Physics MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

30questions
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Sample questions from this chapter

With potential chosen as zero at infinity, what is electrostatic potential at a point?
  1. External work per unit positive test charge brought slowly from infinity ✓
  2. Electric force on a unit negative charge
  3. Work done per unit source charge in a closed path
  4. Electric-field magnitude multiplied by distance for every field
Answer: A. Potential is the limiting external work per unit positive test charge brought without acceleration from infinity.
Why not B: Potential is defined using a positive test charge and is a scalar.
Why not C: Electrostatic work around a closed path is zero and does not define local potential.
Why not D: The product Ed equals potential difference only for suitable displacement in a uniform field.
Using k=9.00×10⁹ N m² C⁻², what is the potential 0.300 m from a +2.00 μC point charge?
  1. 2.00×10⁵ V
  2. 5.40×10³ V
  3. 6.00×10⁴ V ✓
  4. 1.80×10⁴ V
Answer: C. V=kQ/r=(9.00×10⁹)(2.00×10⁻⁶)/0.300=6.00×10⁴ V.
Why not A: This divides kQ by r², using field-like distance dependence.
Why not B: This multiplies kQ by 0.300 m instead of dividing by it.
Why not D: This is kQ before the required division by distance.
How much energy is stored in a 12.0 pF capacitor connected across 50.0 V?
  1. 1.50×10⁻⁸ J ✓
  2. 3.00×10⁻⁸ J
  3. 6.00×10⁻¹⁰ J
  4. 1.50×10⁻⁵ J
Answer: A. U=CV²/2=(12.0×10⁻¹²)(50.0)²/2=1.50×10⁻⁸ J.
Why not B: This uses CV² and omits the one-half charging factor.
Why not C: This uses a value forty times smaller than CV²/2.
Why not D: This treats picofarads as nanofarads, introducing a factor of one thousand.

These are 3 of the 30 questions in the test. Take the full chapter test →

Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Electrostatic Potential and Capacitance →

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Questions

How many NEET and JEE questions are there on Electrostatic Potential and Capacitance?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 12 chapter.

Is this NEET and JEE Physics chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.