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197 questions found · practise this subject as a set Show 20 · 50 per page

#	Question	Subject and topic	Difficulty
21	The electric field due to an infinite plane sheet of uniform charge density σ:	Physics Gauss’s theorem	Medium
22	A charge q is placed at the centre of a cube. The electric flux through any one face of the cube is:	Physics Gauss’s theorem	Hard
23	The electric potential at a distance of 0.5 m from a point charge of 5 nC is:	Physics Electric potential	Easy
24	The work done in moving a charge of 2 μC between two points with a potential difference of 50 V is:	Physics Electric potential	Easy
25	The angle between electric field lines and an equipotential surface is always:	Physics Electric potential	Medium
26	The electrostatic potential energy of charges 1 μC and 2 μC kept 0.1 m apart in vacuum is:	Physics Electric potential	Medium
27	At the midpoint of the line joining two equal and opposite charges, which statement is correct?	Physics Electric potential	Hard
28	Inside a charged metal conductor in electrostatic equilibrium, the electric field is:	Physics Conductors, dielectrics and polarisation	Easy
29	Excess charge given to an isolated conductor resides:	Physics Conductors, dielectrics and polarisation	Easy
30	When a dielectric slab is placed in an external electric field, the field inside the slab:	Physics Conductors, dielectrics and polarisation	Medium
31	Which of the following molecules is polar?	Physics Conductors, dielectrics and polarisation	Medium
32	A person sitting inside a closed metal car is safe from a lightning strike mainly because of:	Physics Conductors, dielectrics and polarisation	Hard
33	Capacitors of 2 μF and 3 μF are connected in series. The equivalent capacitance is:	Physics Capacitors	Easy
34	The energy stored in a 10 μF capacitor charged to 100 V is:	Physics Capacitors	Easy
35	A parallel plate capacitor has plates of area 0.02 m² separated by 1 mm of air. Its capacitance is about:	Physics Capacitors	Medium
36	The space between the plates of an air capacitor is completely filled with a dielectric of constant 5. Its ca…	Physics Capacitors	Medium
37	A capacitor is charged by a battery and then disconnected. If the plate separation is now doubled, the stored…	Physics Capacitors	Hard
38	A steady current of 2 A flows in a wire for 5 minutes. The charge that passes through any cross-section is:	Physics Electric current and drift velocity	Easy
39	A copper wire of cross-section 1 mm² carries 1.5 A. If n = 8.5 × 10²⁸ m⁻³, the drift speed of electrons is ab…	Physics Electric current and drift velocity	Medium
40	The SI unit of electron mobility is:	Physics Electric current and drift velocity	Medium