alleryStart learning →The SI unit of electric charge is the:
- volt
- ampere
- coulomb
- ohm
Show answer and solution
Correct answer: C. coulomb
Charge is measured in coulombs (C). 1 C = 1 A·s.
The fundamental unit of charge is e = 1.6 × 10⁻¹⁹ C (proton/electron magnitude).
Indian Navy SSR Electromagnetism — practice questions
Explore 28 free Electromagnetism questions in Indian Navy SSR Physics. Open each question or exercise to read its content, reference answers and available explanation.
Practise Electromagnetism with Quill →Electromagnetism questions and exercises with answers
Showing questions 1–28 of 28.
The SI unit of electric charge is the:Read the answer and worked solution →Number of charges that can be enclosed in a Gaussian surface in vacuum:Read the answer and worked solution →For a spherical conductor of radius R carrying charge Q, the potential AT THE SURFACE equals:Read the answer and worked solution →3 capacitors of 6 µF each in PARALLEL: total capacitance:Read the answer and worked solution →Electric field inside a spherical cavity in a uniformly charged conductor is:Read the answer and worked solution →Complete the work-energy theoremRead the answer and worked solution →True or false: conservative forcesRead the answer and worked solution →Conservative or not?Read the answer and worked solution →Reading the theoremRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Tap every test for a conservative forceRead the answer and worked solution →Order the reasoning: from work to speedRead the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →True or false: energy bookkeepingRead the answer and worked solution →Speeds up, slows down, or neither?Read the answer and worked solution →Applying the work-energy theoremRead the answer and worked solution →True or false: potential energyRead the answer and worked solution →Kinetic or potential?Read the answer and worked solution →Tap every statement true of a closed pathRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Assertion and reason: energyRead the answer and worked solution →Complete the potential energy relationRead the answer and worked solution →Flip and pair: quantity with what it tracksRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Order the reasoning: why a pendulum keeps swingingRead the answer and worked solution →Conservative or not, in practiceRead the answer and worked solution →
Worked practice questions
Number of charges that can be enclosed in a Gaussian surface in vacuum:
- 1
- Up to 10
- Any number
- Zero
Show answer and solution
Correct answer: C. Any number
Gauss's law works for ANY closed surface enclosing any amount of charge.
The total flux equals q_total/ε₀ regardless of how the charges are distributed inside (point, line, sphere, etc.).
For a spherical conductor of radius R carrying charge Q, the potential AT THE SURFACE equals:
- 0
- kQ/R²
- kQ/R
- 2kQ/R
Show answer and solution
Correct answer: C. kQ/R
V_surface = kQ/R. Same as the field at the surface times R. Note: potential INSIDE a conductor is uniform = surface value; field inside = 0.
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