JEE Main Physics — Electromagnetism previous year questions with solutions.
Current measured by the ammeter $(A)$ in the reported circuit when no current flows through $10\Omega$ resistance, will be _____ $A$. 
An electrical bulb rated $220V,100W$, is connected in series with another bulb rated $220V$, $60W$. If the voltage across combination is $220V$, the power consumed by the $100W$ bulb will be about _____ $W$.
Two identical metallic spheres $A$ and $B$ when placed at certain distance in air repel each other with a force of $F$. Another identical uncharged sphere $C$ is first placed in contact with $A$ and then in contact with $B$ and finally placed at midpoint between spheres $A$and $B$. The force experienced by sphere $C$ will be :
Two capacitors, each having capacitance $40\mu F$ are connected in series. The space between one of the capacitors is filled with dielectric material of dielectric constant $K$ such that the equivalence capacitance of the system became $24\mu F$. The value of $K$ will be :
The RMS value of conduction current in a parallel plate capacitor is $6.9\mu A$. The capacity of this capacitor, if it is connected to $230V$ AC supply with an angular frequency of $600\mathrm{rad}{s}^{-1}$, will be
A long cylindrical volume contains a uniformly distributed charge of density $\rho C{m}^{-3}$. The electric field inside the cylindrical volume at a distance $x=\frac{2{\epsilon }_{0}}{\rho }m$ from its axis is _____ $V{m}^{-1}$. 
Two point charges $Q$ each are placed at a distance $d$ apart. A third point charge $q$ is placed at a distance $x$ from mid-point on the perpendicular bisector. The value of $x$ at which charge $q$ will experience the maximum Coulomb's force is:
A uniform electric field $E=(\frac{8m}{e})V{m}^{-1}$ is created between two parallel plates of length $1m$ as shown in figure, (where $m=$ mass of electron and $e=$ charge of electron). An electron enters the field symmetrically between the plates with a speed of $2m{s}^{-1}$. The angle of the deviation $(\theta )$ of the path of the electron as it comes out of the field will be _____ . 
A charge of $4\mu C$ is to be divided into two. The distance between the two divided charges is constant. The magnitude of the divided charges so that the force between them is maximum, will be:
The volume charge density of a sphere of radius $6m$ is $2\mu C{\mathrm{cm}}^{-3}$. The number of lines of force per unit surface area coming out from the surface of the sphere is _____ $\times {10}^{10}N{C}^{-1}.$ [Given : Permittivity of vacuum ${\epsilon }_{0}=8.85\times {10}^{-12}{C}^{2}{N}^{-1}-{m}^{-2}$]
Eight copper wire of length $l$ and diameter d are joined in parallel to form a single composite conductor of resistance $R$. If a single copper wire of length $2l$ have the same resistance $(R)$ then its diameter will be _____ $d$.
The three charges $\frac{q}{2},q$ and $\frac{q}{2}$ are placed at the corners $A,D$ and $C$ of a square of side $a$ as shown in figure. The magnitude of electric field $(E)$ at the corner $B$ of the square, is 
Two point charges $A$ and $B$ of magnitude $+8\times {10}^{-6}C$ and $-8\times {10}^{-6}C$ respectively are placed at a distance $d$ apart. The electric field at the middle point $O$ between the charges is $6.4\times {10}^{4}N{C}^{-1}$. The distance '$d$' between the point charges $A$ and $B$ is
A vertical electric field of magnitude $4.9\times {10}^{5}N{C}^{-1}$ just prevents a water droplet of a mass $0.1g$ from falling. The value of charge on the droplet will be : (Given $g=9.8m{s}^{-2}$)
The total charge on the system of capacitance ${C}_{1}=1\mu F,{C}_{2}=2\mu F,{C}_{3}=4\mu F$ and ${C}_{4}=3\mu F$ connected in parallel is (Assume a battery of $20V$ is connected to the combination)
A capacitor is discharging through a resistor $R$. Consider in time ${t}_{1}$, the energy stored in the capacitor reduces to half of its initial value and in time ${t}_{2}$, the charge stored reduces to one eighth of its initial value. The ratio $\frac{{t}_{1}}{{t}_{2}}$ will be
Capacitance of an isolated conducting sphere of radius ${R}_{1}$ becomes $n$ times when it is enclosed by a concentric conducting sphere of radius ${R}_{2}$ connected to earth. The ratio of their radii $(\frac{{R}_{2}}{{R}_{1}})$ is:
A condenser of $2\mu F$ capacitance is charged steadily from $0$ to $5C$. Which of the following graph represents correctly the variation of potential difference$(V)$ across its plates with respect to the charge $(Q)$ on the condenser?
A capacitor of capacitance $50\mathrm{pF}$ is charged by $100V$ source. It is then connected to another uncharged identical capacitor. Electrostatic energy loss in the process is____ $\mathrm{nJ}$.
Two metallic plates form a parallel plate capacitor. The distance between the plate is '$d$'. A metal sheet of thickness $\frac{d}{2}$ and of area equal to area of each plate is introduced between the plates. What will be the ratio of the new capacitance to the original capacitance of the capacitor?
A battery of $6V$ is connected to the circuit as shown below. The current $I$ drawn from the battery is 
Two sources of equal emfs are connected in series. This combination is connected to an external resistance $R$. The internal resistances of the two sources are ${r}_{1}$ and ${r}_{2}({r}_{1}>{r}_{2})$. If the potential difference across the source of internal resistance ${r}_{1}$ is zero then the value of $R$ will be
The current $I$ in the given circuit will be 
A $220V,50\mathrm{Hz}$ AC source is connected to a $25V,5W$ lamp and an additional resistance $R$ in series (as shown in figure) to run the lamp at its peak brightness, then the value of $R$ (in ohm) will be 