- [Hard]After disconnecting a charged isolated capacitor from its battery, the plate separation is doubled by hand, so what happens to the stored energy?...
- [Medium]Charging a 10 microfarad capacitor in a camera flash circuit up to a potential of 200 volts stores electrical energy, so how much energy is held?...
- [Easy]Wiring the same 4 microfarad and 12 microfarad capacitors side by side in a parallel bank across one battery gives a total, so what is the equivalent ...
- [Medium]Connecting two capacitors of 4 microfarad and 12 microfarad one after another in a series arrangement gives a combined value, so what is the equivalen...
- [Easy]Filling the gap of an air capacitor completely with a material of dielectric constant 4 changes its ability to store charge, so what is the effect on ...
- [Easy]Sketching the surfaces of constant potential around a single isolated positive point charge on a whiteboard, a teacher asks about their shape, so what...
- [Hard]Two protons are brought from very far apart to a separation of 1 femtometre inside a fusion reactor model, so what is their potential energy?...
- [Medium]Once electrostatic equilibrium is reached inside a solid charged metallic conductor, the electric field within its body has a definite value, so what ...
- [Medium]Inserting a dielectric slab of relative permittivity 5 between capacitor plates while the plates stay connected to nothing keeps the charge fixed, so ...
- [Easy]At a radial distance of 0.5 m from an isolated point charge of 5 nanocoulomb the potential takes a definite value, so what is it?...
- [Easy]Moving a charge of 3 microcoulomb between two points raises its potential energy by changing potential through 200 volts, so how much work is done?...
- [Medium]Using a long charged wire in a physics demonstration, the field around an infinite line charge follows a definite distance dependence, so how does it ...
- [Medium]A cubical Gaussian surface encloses a net charge of 8.85 nanocoulomb at its centre inside a vacuum, so what is the total electric flux through it?...
- [Medium]Along the axial line of a short electric dipole the field falls off with distance in a characteristic manner, so how does it vary with r?...
- [Medium]An electric dipole of moment 4 \times 10^{-9} C·m is placed at 30 degrees to a uniform field of 5 \times 10^4 N/C, so what torque acts on it?...
- [Easy]When drawn around an isolated negative point charge on paper, electric field lines behave in a very specific way, so which statement is correct?...
- [Easy]A tiny oil droplet carrying a charge of 5 nanocoulomb experiences a force of 2 millinewton in a laboratory field, so what is the field strength?...
- [Medium]Three equal positive charges sit at the corners of an equilateral triangle, and a student wants the net force on any one charge, so which direction do...
- [Easy]Two identical point charges of 2 microcoulomb each are placed 30 cm apart in vacuum, so what is the magnitude of the electrostatic force between them?...
- [Medium]Two charges 2×10⁻⁶ C and 3×10⁻⁶ C are 0.20 m apart. Force magnitude? (k = 9×10⁺⁹ N·m²/C²)...
- [Easy]Electrostatic force between two point charges varies directly with?...
- [Easy]Electric field at distance r from point charge Q?...
- [Easy]Potential at distance r from isolated charge Q (zero at infinity)?...
- [Medium]Work to move charge q between equipotential surfaces with potential difference ΔV equals?...
- [Easy]Net electric flux through closed surface equals?...
- [Easy]Electric field inside a conductor (electrostatic equilibrium) is?...
- [Medium]Capacitance of parallel plate capacitor (area A, separation d, vacuum) is?...
- [Medium]Fully inserting dielectric (constant K) between plates (battery disconnected) changes capacitance by factor?...
- [Easy]Energy stored in capacitor with capacitance C and potential V?...
- [Medium]Equivalent capacitance of two capacitors C1 and C2 in series equals?...
- [Easy]If distance between two point charges doubles, electrostatic force becomes?...
- [Medium]Potential energy of two charges q1 and q2 separated by r?...
- [Easy]Electric field is ______ to equipotential surfaces....
- [Hard]For uniformly charged solid sphere (total charge Q, radius R), field at distance r<R from center?...