JEE Main Electric Charges and Fields — practice questions
48 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice JEE Main Electric Charges and Fields in the app →Two point charges of $+2\ \mu$C and $+3\ \mu$C are placed $30$ cm apart. The Coulomb force between them is:A point charge of $5\ \mu$C is placed at the origin. The electric field magnitude at $0.5$ m is:A dipole consists of $+q$ and $-q$ separated by distance $d$. Its dipole moment direction is:A closed surface encloses a net charge of $4\ \mu$C. The total electric flux through the surface is:The discovery that rubbed amber attracts light objects is credited to:The word electricity comes from the Greek word elektron, meaning:Thales of Miletus made his observation about amber around:A metal rod held in the hand and rubbed with wool shows:A neutral pith ball joined by copper wire to a negative rod acquires a charge that is:Substances that let electricity pass through them easily are called:Conductors contain electrons that are comparatively:Which of these is listed as a conductor?Glass, porcelain, plastic and wood are examples of:Charge transferred to a conductor readily gets:Charge placed on an insulator:The effects of positive and negative charge tend to:Charged bodies much smaller than their separation are treated as:Charges add up like:Charge has magnitude but no:Unlike charge, the mass of a body is always:The total charge of a system with charges +1, +2, -3, +4 and -5 units is:When two bodies are rubbed, what one body gains in charge the other:The total charge of an isolated system is always:When a neutron turns into a proton and an electron, the total charge is:Free charges come in integral multiples of a basic unit written as:Coulomb found the force between two point charges varies inversely as the:A physicist records a charge measurement in SI units, named after a French physicist. That unit is the:Experiments established that charge comes in how many types?If a charge vanished in one place and appeared far away, one law would still hold. That law is the conservatioCharge cannot take just any value, but comes in whole multiples of a basic amount. Charge is therefore said toCoulomb's law says the force between two charges falls off with the square of the distance. That relationship That same force grows in proportion to the net charge on each object. That dependence is:Forces from several charges on one object can simply be added as vectors. That rule is the principle of:Materials that do not let electric charge move away through them are called:A charged rod is brought near a metal sphere without touching, and the sphere's charges rearrange. That procesIn an insulator the same approach shifts the electron distribution slightly. That effect is called inducing:Once that shift happens, unlike charges sit closer than like charges, so the object feels a net:Rather than describing the force on one particular test charge, physicists define a quantity independent of itDrawings that let us picture how charge alters the surrounding space are electric field:A student draws two of those lines crossing. That drawing must be wrong, because field lines never:Where those lines are packed more densely, the field is:Two equal and opposite charges separated by a small distance form a dipole, characterised by its dipole:Placed in a uniform field, such a dipole experiences a turning effect that changes its angular velocity. That If the two ends of a dipole can be pulled apart, induction can create charged objects without any:A test charge or a source charge moves, and as a result the force between them:Benjamin Franklin explained early observations by supposing that one type of charge stayed put while the otherCompared with the tiny nucleus, the electrons around it form a cloud that is:A charged comb picks up small pieces of paper that carry no net charge, because the paper is first: