JEE Main Electrostatics — practice questions
92 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice JEE Main Electrostatics in the app →If charge is defined as the deficiency or excess of electrons on a body, which situation will make a neutral bWhat is meant by static electricity?Which pair of charges will attract each other?Two bodies carrying like charges are brought near each other. What happens?Which statement about electric charge is correct?A body has an excess of electrons. What kind of net charge does it possess?Which statement about the force between two charges is correct according to the given law?Two point charges exert a force $F$ on each other. If each charge is halved and the distance is also halved, tWhich change will leave the electrostatic force between two point charges unchanged according to $F = k\dfrac{An isolated system contains charges $+5\,\text{C}$ and $-5\,\text{C}$. If they are brought together, which staIf both charges are doubled and the separation between them is kept unchanged, the electrostatic force becomesTwo charges are moved so that the distance between them becomes three times the original value. The new electrIf $q_1 = q_2 = 1\,\text{C}$ and $r = 1\,\text{m}$ in the relation $F = k\dfrac{q_1 q_2}{r^2}$, then the magniIn the given expression $F = k\dfrac{q_1 q_2}{r^2}$, what does the constant $k$ represent in this content?Which formula matches the form of Coulomb's law given in the notes for two charges $q_1$ and $q_2$ separated bThe dependence of electrostatic force on separation between two point charges is best described asTwo point charges are separated by a distance $r$. If one charge is doubled and the other remains unchanged, tIf the distance between two point charges is doubled while the charges remain unchanged, the electrostatic forAccording to Coulomb's law, the electrostatic force between two point charges is directly proportional toWhich statement correctly expresses the principle of conservation of electric charge?Two point charges of $+4\ \mu$C each are separated by $0.6$ m in vacuum. The magnitude of the electrostatic foWhat is the electric field at the centre of a hollow conducting sphere of radius $R$ carrying total charge $Q$A parallel-plate capacitor has capacitance $C_0$ in vacuum. A dielectric slab of dielectric constant $K = 4$ iTwo capacitors of $6\ \mu$F and $3\ \mu$F are connected in series across a $12$ V battery. What is the equivalAn electric dipole of moment $p$ is placed at $60°$ to a uniform electric field of magnitude $E$. The torque oA point charge $+q$ is placed at the centre of a cube. What is the electric flux through one face of the cube?The SI unit of electric charge is the:Coulomb's law: force between two point charges is proportional to:The value of k in Coulomb's law (in SI) is approximately:Electric field strength at a point is defined as force per unit:Total electric flux through a closed surface enclosing charge q (Gauss's law) is:Electric field due to an INFINITE SHEET of charge with surface charge density σ:The principle that charge can be neither created nor destroyed is:Two point charges +2μC and -3μC are separated by 30 cm. The force on each (k = 9 × 10⁹):Electric field due to a point charge q at distance r:A charge of 1 C placed in an electric field of 100 N/C experiences force:Electric potential V due to point charge q at distance r:Potential difference between two points is 12 V. Work done to move 2 C between them:Electric field INSIDE a conductor in electrostatic equilibrium is:At an axial point of an electric dipole at distance r >> a (a = dipole half-length, p = qa·2 the dipole momentNumber of charges that can be enclosed in a Gaussian surface in vacuum:For a parallel plate capacitor with plate area A and separation d, the capacitance in vacuum:Capacitance changes when DIELECTRIC of relative permittivity K is inserted:Energy stored in a capacitor with charge Q and capacitance C:Two charges +q and +q are placed at corners of an equilateral triangle. The third corner has potential:For a spherical conductor of radius R carrying charge Q, the potential AT THE SURFACE equals:Equipotential surfaces around a point charge are:Two capacitors 2 µF and 4 µF connected in SERIES across 12 V. Charge on each:3 capacitors of 6 µF each in PARALLEL: total capacitance:Two charged spheres each of radius R, charge Q, separated by distance d >> R. Force F between them is:Potential at center of square (side a) with charges +q, -q, +q, -q at corners (alternating):Electric field inside a spherical cavity in a uniformly charged conductor is:Find work done to bring a +2 µC charge from infinity to a point where V = 50 V:A charged particle q is held at rest in vertical equilibrium in a uniform electric field E pointing upward. ChIn a capacitor circuit, when a dielectric is inserted while voltage is HELD CONSTANT by battery, the CHARGE onCoulomb's law gives the force between two point charges q₁ and q₂ separated by distance r in vacuum asTwo point charges of +2 μC each are placed 3 m apart in vacuum. The force between them is (k = 9 × 10⁹ N m²/C²The electric field at distance r from an isolated point charge q isThe electric field of an infinite line of charge with linear charge density λ at perpendicular distance r isThe electric field just outside a uniformly charged infinite plane with surface charge density σ isGauss's law states that the total electric flux through a closed surface equalsAn electric dipole consists of two equal and opposite point charges ±q separated by distance 2a. Its dipole moThe electric field on the axial line of a short electric dipole at distance r isAn electric dipole in a uniform electric field E experiencesThe principle of quantisation of electric charge is stated asTwo charges +q and −q of equal magnitude are placed at the corners A and B of an equilateral triangle. The netThe electric flux through a closed surface enclosing a charge of +5 μC is (ε₀ = 8.85 × 10⁻¹² C²/N m²)For a charge distribution with volume density ρ, the total charge Q equalsThe SI unit of electric field isIf a positive point charge is placed at the centre of a spherical conducting shell of radius R (neutral), the A physicist records a charge measurement in SI units, named after a French physicist. That unit is the:Experiments established that charge comes in how many types?If a charge vanished in one place and appeared far away, one law would still hold. That law is the conservatioCharge cannot take just any value, but comes in whole multiples of a basic amount. Charge is therefore said toCoulomb's law says the force between two charges falls off with the square of the distance. That relationship That same force grows in proportion to the net charge on each object. That dependence is:Forces from several charges on one object can simply be added as vectors. That rule is the principle of:Materials that do not let electric charge move away through them are called:A charged rod is brought near a metal sphere without touching, and the sphere's charges rearrange. That procesIn an insulator the same approach shifts the electron distribution slightly. That effect is called inducing:Once that shift happens, unlike charges sit closer than like charges, so the object feels a net:Rather than describing the force on one particular test charge, physicists define a quantity independent of itDrawings that let us picture how charge alters the surrounding space are electric field:A student draws two of those lines crossing. That drawing must be wrong, because field lines never:Where those lines are packed more densely, the field is:Two equal and opposite charges separated by a small distance form a dipole, characterised by its dipole:Placed in a uniform field, such a dipole experiences a turning effect that changes its angular velocity. That If the two ends of a dipole can be pulled apart, induction can create charged objects without any:A test charge or a source charge moves, and as a result the force between them:Benjamin Franklin explained early observations by supposing that one type of charge stayed put while the otherCompared with the tiny nucleus, the electrons around it form a cloud that is:A charged comb picks up small pieces of paper that carry no net charge, because the paper is first: