CBSE Class 12 (Science) Electrostatic Potential and Capacitance — practice questions
91 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 12 (Science) Electrostatic Potential and Capacitance in the app →Electric potential is a:An equipotential surface is perpendicular to:Capacitance of a parallel-plate capacitor is:Energy stored in a capacitor equals:Capacitors in series share:Time constant of an RC circuit is:The SI unit of electric potential isElectric potential at infinity in the standard syllabus convention is taken asThe SI unit of capacitance isElectric field at any point inside a hollow charged conductor isOn an equipotential surface, the work done in moving a test charge between any two points isThe potential at a distance 0.30 m from a point charge of +20 nC is (k = 9 × 10⁹ N m² C⁻²)A parallel-plate capacitor in vacuum has plate area A and separation d. Its capacitance isThree capacitors of 2 µF each are connected in series. The equivalent capacitance isThe work done in bringing a charge q from infinity to a point where the potential is V isTwo capacitors of 4 µF and 6 µF are connected in parallel and charged by a 10 V battery. The total charge storWhen the separation between the plates of an air parallel-plate capacitor is doubled (keeping plate area constAn electric dipole of moment p is placed in a uniform field E. The work done to rotate it from the orientationA 5 µF capacitor is charged to 200 V. The energy stored in it isAn isolated conducting sphere of radius R carries a charge Q. The electric potential at its centre is (V(∞) = Four equal point charges q sit at the corners of a square of side d. The work needed to assemble this configurPotential is defined as work done per unit test charge so that the result:Which is physically significant, the actual value of potential or the potential difference?Bringing a unit positive charge from infinity to a point, without acceleration, measures the point's:Volta built the first battery from a stack of metal disks and moist:A surface where the potential has the same value at every point is called:Around a single point charge the equipotential surfaces are:At any point the electric field meets the equipotential surface:In a uniform field along x, the equipotential surfaces are planes:The electric field points in the direction in which the potential:Inside a conductor in the static situation, the electrostatic field is:You charge a metal ball. Where does the excess charge sit?The electrostatic potential inside and on the surface of a conductor is:Dielectrics differ from conductors because they have:In O2 and H2 molecules the centres of positive and negative charge coincide. They are:Two conductors separated by an insulator form a:A capacitor's plates carry Q and minus Q. The total charge of the capacitor is:The ratio Q/V for a capacitor is a constant called its:A capacitor with a large capacitance can hold a large charge at a:The largest field a dielectric can withstand without breaking down is its:A parallel plate capacitor is two large flat plates separated by a:Capacitors in series all carry:Capacitors in parallel all have: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 equipotential surfaces of a single point charge areThe 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 is a capacitor?What 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?