AP EAPCET (Engineering) Electrostatic Potential and Capacitance — practice questions
90 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice AP EAPCET (Engineering) Electrostatic Potential and Capacitance in the app →What is the work done in bringing a unit positive charge from infinity called?The farad, the SI unit of capacitance, equals which ratio?A 2 μF capacitor is charged to 12 V. What charge does it hold?How much energy is stored in a 10 μF capacitor charged to 100 V?Capacitors of 6 μF and 3 μF are joined in series. What is the combined capacitance?An air capacitor of 2 nF is filled with a dielectric of constant 5. New capacitance?A 3 μF capacitor holds 60 μC. What is the potential difference across it?A capacitor stores 4 μC at 500 V. How much energy does it hold?A 2 μC charge moves across a potential difference of 50 V. Energy gained?An electron is accelerated through 100 V. Its energy gain in joules isPlate area and plate gap of a parallel plate capacitor are both doubled. CapacitanceThe gap of a parallel plate capacitor is cut to half. Its capacitanceFor two identical capacitors, parallel capacitance divided by series capacitance isAt the midpoint between equal and opposite point charges, the potential isCharges of 2 μC and 3 μC sit 0.6 m apart in vacuum. Their potential energy isIf the voltage across a capacitor is doubled, the stored energyA dielectric slab enters a capacitor after the battery is removed. Voltage across platesA dipole in a uniform field has least potential energy when it isA dipole is held perpendicular to a uniform field. Its potential energy isElectric energy density, energy per unit volume, has which unit?In a field E, the energy per unit volume is given byThe dielectric strength of air is aboutWhat potential difference across a 1 cm air gap reaches air's breakdown field?The electric field at a point is directed how to the equipotential surface there?Work done moving a test charge over an equipotential surface isJust outside a charged conductor with surface density σ, the field magnitude isIn electrostatic equilibrium, excess charge on a conductor sitsInside a charged conductor, the potential isA conductor has surface charge density 8.85 × 10⁻¹⁰ C/m². Field just outside?Which application follows from zero field in a conductor's cavity?Which of these is a non-polar molecule?A non-polar molecule has no permanent dipole because its charge centresPolarisation of a dielectric has what effect on the net field inside it?With a dielectric of constant K filling the gap, capacitance becomesWhat does the capacitance of a given capacitor depend on?Why does a capacitor leak charge at very high voltage?A farad is very big, so practical capacitors are usually inAt large distance, the potential of an electric dipole falls off asThe potential due to a point charge at the location of that charge isPotential energy of a system of charges equals the work done inA charge q sits in an external potential V. Its potential energy isThe potential due to many point charges is found by taking theWhat is the potential 0.27 m from a 3 nC point charge in vacuum?Plates 4 mm apart have 200 V between them. The uniform field isWhich expression gives the capacitance of a vacuum parallel plate capacitor?For capacitors in series, which quantities add to give the total?A charged, isolated capacitor gets a dielectric of K = 5 between its plates. Its voltage?The distance from a point charge is doubled. The potential becomes?How much work moves a 2 µC charge through a potential difference of 50 V?Charges +3 µC and –3 µC lie 1 m apart. Potential at the midpoint?A capacitor's capacitance is fixed by which of these?The gap between the plates of a capacitor is halved. Its capacitance?Plates of area 0.01 m² are 1 mm apart in air. Capacitance (ε0 = 8.85 × 10⁻¹² F/m)?Which quantity is the same for every capacitor in a series chain?The net capacitance of capacitors in series is always?Three equal capacitors C joined in parallel give a net capacitance of?A capacitor's charge is doubled at fixed capacitance. Energy stored?Which potential quantity is physically significant?The electric field points toward which change of potential?Potential energy of a charge q in an external potential V is?Potential energy of a dipole p in a uniform field E is?Dipole potential at large distance r falls off as?Where can excess charge on a conductor reside?A conductor's surface field just outside is directed how?Field in an empty cavity inside a conductor is?Electrostatic shielding by a conductor cavity protects against?At the surface of a charged spherical shell, which quantity is discontinuous?Potential on a charged conducting sphere's surface of radius 0.1 m, charge 10 nC?What does the torque p × E on a dipole do in a uniform field?In an external field, a polar or non-polar dielectric develops?Inside a dielectric, the field of polarisation is directed how?Why does a dielectric raise a capacitor's capacitance?Dielectric constant K of a material has which unit?Polarisation is defined as dipole moment per?The potential at a point due to several charges is found by?A battery stays connected while a dielectric is inserted. The charge on the plates?Which Gaussian surface gives the field at a conductor's surface?Potential inside a charged solid conductor is what?Why can a conductor's surface field have no tangential part?Inside an empty cavity within a conductor, the field equals what?A capacitor is basically which kind of system?A capacitor's plates carry Q and minus Q. What is the total charge of the capacitor?How can a single isolated conductor act as a capacitor?Which pair consists only of non-polar molecules?What does a non-polar molecule develop when placed in an external electric field?A 500 pF capacitor is connected across a 60 V battery. How much energy does it store?A charged capacitor is disconnected and joined to an identical uncharged one. What happens to the stored energWhy is capacitor energy independent of how charge was built up?If the charge on a capacitor is doubled, what happens to the field between its plates?In a system of several conductors in equilibrium, what is true of their potentials?