TS EAMCET Electric Charges and Fields — practice questions
77 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice TS EAMCET 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: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: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 isIf a point charge is placed **outside** a closed Gaussian surface, the total flux through the surface is:For 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:What is the magnitude of the charge on one electron?Who introduced the names positive and negative for the two kinds of charge?When a glass rod is rubbed with silk, which charge transfer takes place?By convention, which of these carries a positive charge after rubbing?What is the approximate value of the Coulomb constant k in SI units?What is the experimental value of the permittivity of free space ε0?The ratio of electric to gravitational force between a proton and an electron is about what?What does the net force on one charge due to several others equal?If the distance between two point charges is doubled, the Coulomb force becomes what fraction?If the distance between two charges becomes three times, the force changes by what factor?How is the electric field at a point defined?A point charge of 4 μC sets up what field at 3 m from it in vacuum?What is the direction of the field due to a negative point charge?At any point on a field line, the tangent gives what?Where are electric field lines drawn closest together?What do field lines look like in a region of constant electric field?An electric dipole consists of what?What is the magnitude of the dipole moment for charges ±q separated by 2a?Charges of +3 μC and –3 μC are 2 cm apart. What is the dipole moment?Which way does the dipole moment vector point?At large distance r, how does a dipole's electric field fall off?At the same large distance, the axial field of a dipole is how many times its equatorial field?What is the equatorial plane of a dipole?A dipole in a uniform electric field experiences what?By Gauss's law, flux through a closed surface equals what?A closed surface encloses 8.854 μC in vacuum. What is the net flux through it?For a closed surface, which way is the area vector taken?How does the field of a long straight charged wire depend on distance r?An infinite thin plane sheet has uniform surface charge density σ. What is the field magnitude?A shell of radius R has surface charge density σ. What is its total charge?Which carriers are mobile in metals?Additivity of charge means the total charge of a system is what?What does conservation of charge say about an isolated system?Quantisation of charge means any charge is what?Why can quantisation of charge be ignored for everyday objects?What is the charge on 5 × 1010 electrons?Roughly how many electrons together carry one coulomb of charge?One coulomb is the charge flowing through a wire in 1 s when the current is what?Who is credited with first noticing that rubbed amber attracts light objects?The word electricity comes from the Greek word elektron, which means what?A plastic rod rubbed with cat's fur acquires which kind of charge by convention?A glass rod is rubbed with silk. What actually moves between them?Which of these materials is a good electrical insulator?About how many elementary charges make up a total charge of 1 C?If 10^9 electrons leave a body every second, roughly how long to lose 1 C?Two 1 C charges are placed 1 m apart in vacuum. What force acts between them?Charges of 2 microcoulomb and 3 microcoulomb lie 0.3 m apart. What is the force?Which unit correctly expresses the permittivity of free space?The electric force between a proton and an electron exceeds their gravity by about what factor?Two protons 10^-15 m apart in a nucleus repel with an electric force near what value?The force between two charges stays unchanged by a nearby third charge. This is called what?What is the SI unit of electric field strength, in terms of force and charge?The field at a point is found using a test charge q. How does the field depend on q?A proton (1.67e-27 kg) sits in a field of 2.0e4 N/C. Its acceleration is about?Which statement about electrostatic field lines is correct?A dipole has charges of 3 microcoulomb each, separated by 2 cm. Its moment is?Far from a dipole, how does its electric field fall with distance r?For a closed surface, which direction is taken for the area element vector?A uniformly charged thin spherical shell produces what field at points inside it?Outside a charged thin shell, the field acts as if the charge sat where?The zero field inside a charged shell confirms which feature of Coulomb's law?Who first formulated what is now called Gauss's law, in 1773?Gauss's law is one of which set of fundamental equations?Which extra assumption yields Coulomb's law from Gauss's law?Which law remains valid for moving charges, unlike Coulomb's law?