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JEE Main Electrostatics: related Physics practice

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Physics questions and exercises with answers

Showing questions 1–30 of 40.

Coulomb's law gives the force between two point charges q₁ and q₂ separated by distance r in vacuum asRead the answer and worked solution →Two point charges of +2 μC each are placed 3 m apart in vacuum. The force between them is (k = 9 × 10⁹ N m²/C²)Read the answer and worked solution →The electric field at distance r from an isolated point charge q isRead the answer and worked solution →The electric field of an infinite line of charge with linear charge density λ at perpendicular distance r isRead the answer and worked solution →The electric field just outside a uniformly charged infinite plane with surface charge density σ isRead the answer and worked solution →Gauss's law states that the total electric flux through a closed surface equalsRead the answer and worked solution →An electric dipole consists of two equal and opposite point charges ±q separated by distance 2a. Its dipole moment magnitude isRead the answer and worked solution →The electric field on the axial line of a short electric dipole at distance r isRead the answer and worked solution →The electric flux through a closed surface enclosing a charge of +5 μC is (ε₀ = 8.85 × 10⁻¹² C²/N m²)Read the answer and worked solution →For a charge distribution with volume density ρ, the total charge Q equalsRead the answer and worked solution →A physicist records a charge measurement in SI units, named after a French physicist. That unit is the:Read the answer and worked solution →Experiments established that charge comes in how many types?Read the answer and worked solution →If a charge vanished in one place and appeared far away, one law would still hold. That law is the conservation of:Read the answer and worked solution →Charge cannot take just any value, but comes in whole multiples of a basic amount. Charge is therefore said to be:Read the answer and worked solution →Coulomb's law says the force between two charges falls off with the square of the distance. That relationship is called:Read the answer and worked solution →That same force grows in proportion to the net charge on each object. That dependence is:Read the answer and worked solution →Forces from several charges on one object can simply be added as vectors. That rule is the principle of:Read the answer and worked solution →Materials that do not let electric charge move away through them are called:Read the answer and worked solution →A charged rod is brought near a metal sphere without touching, and the sphere's charges rearrange. That process is charging by:Read the answer and worked solution →In an insulator the same approach shifts the electron distribution slightly. That effect is called inducing:Read the answer and worked solution →Once that shift happens, unlike charges sit closer than like charges, so the object feels a net:Read the answer and worked solution →Rather than describing the force on one particular test charge, physicists define a quantity independent of it. That quantity is the electric:Read the answer and worked solution →Drawings that let us picture how charge alters the surrounding space are electric field:Read the answer and worked solution →A student draws two of those lines crossing. That drawing must be wrong, because field lines never:Read the answer and worked solution →Where those lines are packed more densely, the field is:Read the answer and worked solution →Two equal and opposite charges separated by a small distance form a dipole, characterised by its dipole:Read the answer and worked solution →Placed in a uniform field, such a dipole experiences a turning effect that changes its angular velocity. That effect is a:Read the answer and worked solution →If the two ends of a dipole can be pulled apart, induction can create charged objects without any:Read the answer and worked solution →A test charge or a source charge moves, and as a result the force between them:Read the answer and worked solution →Benjamin Franklin explained early observations by supposing that one type of charge stayed put while the other:Read the answer and worked solution →

Worked practice questions

Coulomb's law gives the force between two point charges q₁ and q₂ separated by distance r in vacuum as

  1. F = k q₁ q₂ / r²
  2. F = k q₁ q₂ / r
  3. F = k q₁ q₂ × r
  4. F = k q₁ q₂ × r²
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Correct answer: A. F = k q₁ q₂ / r²

1. Coulomb's law is the fundamental inverse-square law for electric force. 2. F = k q₁ q₂ / r² where k = 1/(4πε₀) ≈ 9 × 10⁹ N m² C⁻². 3. The force is attractive for opposite charges, repulsive for like. 4. It acts along the line joining the two charges. _Source: syllabus Physics, Ch 1 "Electric Charges and Fields", §1.5_

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Two point charges of +2 μC each are placed 3 m apart in vacuum. The force between them is (k = 9 × 10⁹ N m²/C²)

  1. 0.4 mN
  2. 4 mN
  3. 4 N
  4. 40 N
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Correct answer: B. 4 mN

1. F = k q₁ q₂ / r². 2. Substitute: F = 9 × 10⁹ × (2 × 10⁻⁶)² / 3². 3. = 9 × 10⁹ × 4 × 10⁻¹² / 9 = 4 × 10⁻³ N = 4 mN. 4. So the mutual force is 4 milli-newtons. _Source: syllabus Physics, Ch 1 "Electric Charges and Fields", §1.5_

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The electric field at distance r from an isolated point charge q is

  1. E = kq / r
  2. E = kq × r
  3. E = kq / r²
  4. E = kq × r²
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Correct answer: C. E = kq / r²

1. Electric field is force per unit test charge. 2. From Coulomb's law: E = F/q_test = k q / r². 3. Direction is radially outward for positive q, inward for negative. 4. SI unit is N/C or equivalently V/m. _Source: syllabus Physics, Ch 1 "Electric Charges and Fields", §1.6_

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More Physics topics

Electric Charges and FieldsMechanical Properties of Solids and FluidsSemiconductor ElectronicsWave OpticsCurrent ElectricityUnit 2A: Newton's Laws and Translational EquilibriumMoving Charges and MagnetismAtoms and Nuclei