NEET UG Electric Charges and Fields — practice questions
56 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice NEET UG Electric Charges and Fields in the app →Quantisation of electric charge means:If 10⁹ electrons leave a body every second, the time required to accumulate a total charge of 1 C is approximaA charge of −12 nC is given to a body. The number of excess electrons on the body is:In any process the total electric charge of an isolated system is conserved. This means:When a glass rod is rubbed with silk, the glass rod becomes positively charged because:Coulomb's law in vacuum is F = (1/4πε₀)(q₁q₂/r²). The value of 1/4πε₀ is approximately:Two point charges q₁ and q₂ separated by distance r in vacuum experience force F. If both charges are doubled The SI unit of electric field is:Two point charges +q and −q are placed at positions (−a, 0) and (+a, 0). The electric field at the origin (0, The electric field on the **axis of a dipole** (dipole moment p, distance r from centre, r >> a) is given by:The electric field on the **equatorial line** of a dipole (perpendicular bisector, r >> a) has magnitude:A dipole of moment p is placed in a uniform external field E. The torque on the dipole is:A dipole of moment 10⁻²⁹ C·m is placed in a uniform field of 10⁵ N/C at angle 30°. The torque on the dipole isGauss's law states that the electric flux through any closed surface is:If a point charge is placed **outside** a closed Gaussian surface, the total flux through the surface is:Using Gauss's law, the electric field due to an **infinite plane sheet of charge** with surface charge densityFor a uniformly charged thin spherical shell of radius R and total charge Q, the electric field INSIDE the sheLinear charge density λ has SI units:Electric field lines for a static charge:Two point charges +4q and +q are placed at a distance L apart. At what distance from +4q (on the line joining Two point charges of $+2\ \mu$C and $+3\ \mu$C are placed $30$ cm apart. The Coulomb force between them is:A point charge of $5\ \mu$C is placed at the origin. The electric field magnitude at $0.5$ m is:A dipole consists of $+q$ and $-q$ separated by distance $d$. Its dipole moment direction is:A closed surface encloses a net charge of $4\ \mu$C. The total electric flux through the surface is:The smallest charge that can exist freely in nature isTwo point charges $q_1$ and $q_2$ separated by distance $r$ in vacuum attract each other with force $F$. If boThe principle of SUPERPOSITION for electric forces states that the net force on a charge due to multiple otherAn electric dipole of dipole moment $\vec{p}$ is placed in a UNIFORM electric field $\vec{E}$. The torque expeThe electric field at a distance $r$ from a POINT charge $q$ (in vacuum) has magnitudeGauss's law in integral form states that the electric flux through a CLOSED surface equalsThe electric field just OUTSIDE a uniformly charged conducting sphere of total charge $Q$ and radius $R$, at aInside a uniformly charged conducting sphere (in equilibrium), the electric field isTwo identical small spheres carry charges $+10\,\mu\text{C}$ each and are placed $30\,\text{cm}$ apart in vacuAn ELECTRIC DIPOLE consists of charges $+q$ and $-q$ separated by a small displacement $2a$. The dipole momentThe electric field due to an INFINITELY long straight uniformly charged wire (linear charge density $\lambda$)The electric field due to an INFINITE plane sheet of uniform surface charge density $ igma$ (in vacuum) isIf a charge $q$ is placed in a medium of dielectric constant $K$ instead of vacuum, the Coulomb force between Which property is TRUE for electric field LINES?Coulomb's law gives the electrostatic force between two point charges as:SI unit of electric charge is the coulomb (C). 1 C is approximately:Electric field E at a point due to a point charge q at distance r is:Electric flux Φ through a closed surface enclosing total charge Q_enc (Gauss's law) equals:An infinite uniform line of linear charge density λ produces an electric field at perpendicular distance r equJust outside a large uniformly-charged conducting sheet with surface charge density σ, the magnitude of the elTwo equal point charges q each are placed at distance d. The electrostatic PE of the system (zero at infinity)Electric potential V due to a point charge q at distance r is:The electric field at the centre of a uniformly-charged thin spherical SHELL of radius R is:An electric dipole consists of charges +q and −q separated by 2a. The dipole moment magnitude is:Torque on a dipole of moment p placed in a uniform field E at angle θ is:An electron (q = −e, mass m) accelerated from rest through a potential difference V gains kinetic energy:Two large parallel conducting plates carry equal and opposite surface charge density σ. The electric field BETAn electric field of 1000 V m⁻¹ exists between two parallel plates 4 cm apart. The potential difference betweeEquipotential surfaces are everywhere:According to Coulomb's law, the electrostatic force between two point charges $q_1$ and $q_2$ separated by disTwo point charges repel each other with force $F$. If the distance between them is doubled while both charges In SI units the constant $k$ in Coulomb's law $F = k\frac{q_1 q_2}{r^2}$ is approximately