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Recent questions in Class12
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JEEMAIN and NEET
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Physics
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Class12
Class12
Electric Charges and Fields
Electrostatic Potential and Capacitance
Current Electricity
Moving Charges and Magentism
Magnetism and Matter
Electromagnetic Induction
Alternating Current
Electromagnetic Waves
Ray Optics and Optical Instruments
Wave Optics
Dual Nature of Matter and Radiation
Atoms
Nucleii
Semiconductor Materials and Electronic Devices
Communication Systems
Experimental Skills in Physics
A capacitor of capacitance $C_0$ is charge to potential $V_0$ and then isolated . A small capacitor C is charged from $C_0$, discharge and then charged again; this process is repeated n times. Due to this potential of $C_0$ decreases to r. Value of C is :
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
parallel-plate-capacitor
difficult
asked
Jan 15, 2014
by
meena.p
1
answer
If electric field $\overrightarrow{E} = 2\hat i +3 \hat j $ , Potential difference between two point $V_A- V_B$, where $r_A=\hat i+ 2 \hat j $ and $r_B=2 \hat i +\hat j + 3 \hat k $ will be
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
difficult
asked
Jan 15, 2014
by
meena.p
1
answer
Two thin rings of radius R are placed at a distance a between them such that their axes coincide. Potential difference between the centre of the ring will be , if charges on rings are $+q $ and $-q$
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
continuous-charge-distribution
difficult
asked
Jan 13, 2014
by
meena.p
1
answer
A spherical shell of radius R has a charge Q uniformly distributed on its surface. What is the force exerted by one half over the other.
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
continuous-charge-distribution
difficult
asked
Jan 13, 2014
by
meena.p
1
answer
Find electric field at point $(a,a,a) $ due to three infinitely long lines of charge density $\lambda$ along $x,y $ and $ z$ axis
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
continuous-charge-distribution
difficult
asked
Jan 13, 2014
by
meena.p
1
answer
Three identical spheres , each having a charge q and radius R are kept in such a way that each touches the other two. Find magnitude of electric force on any sphere due to other two sphere,
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
force-between-multiple-charges
difficult
asked
Jan 13, 2014
by
meena.p
1
answer
What will be the electric field at point P. Assume (r >> a)
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
force-between-multiple-charges
difficult
asked
Jan 13, 2014
by
meena.p
1
answer
The capacitor plates are fixed on inclined plane p connected to a battery of emf E. A dielectric slab of mass m and dielectric constant k is inserted into the capacitor and tied to mass M using a weightless string as shown. If capacitance have plate area A, length l and distance d between them. Find M such that slab stays in equilibrium. Assume zero friction between slab and plates
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
effect-of-dielectric-on-capacitance
difficult
asked
Jan 13, 2014
by
meena.p
1
answer
A ring of radius R carries charge $+q$ uniformly distributed on it. If a charge $- 90$ is released on ring's axis at a distance $\sqrt 3 R$ from its centre , the kinetic energy of $-90$ when it reaches the centre of ring will be :
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
difficult
asked
Jan 13, 2014
by
meena.p
1
answer
Six plates of same area A are arranged as shown. Equivalent capacitance of arrangement between A and B is :
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
combination-of-capacitors
difficult
asked
Jan 13, 2014
by
meena.p
1
answer
A uniform electric field of $200 \;Vm^{-1} $ is directed $60^{\circ}$ to $+ve$ X-axis . If $OA=2 m, V_0-V_A$ is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
difficult
asked
Jan 13, 2014
by
meena.p
1
answer
Three concentric spherical conductors are shown, Find equivalent capacitance b/w A and B
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
combination-of-capacitors
difficult
asked
Jan 13, 2014
by
meena.p
1
answer
A parallel plate capacitor is immersed in liquid of dielectric constant K. Find force per unit area acting on plate from the liquid from dielectric in contact with the plate.
jeemain
physics
class12
unit11
electrostatics
difficult
asked
Jan 13, 2014
by
meena.p
1
answer
A cylindrical layer of homogeneous dielectric with dielectric constant K is introduced in a cylindrical capacitor so that a gap of width d is filled in between them. Radius of plate $R > > d$. If the capacitor is connected to battery of EMF V, the force pulling the dielectric inside the capacitor is :
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
effect-of-dielectric-on-capacitance
difficult
asked
Jan 13, 2014
by
meena.p
1
answer
A point charge Q is placed at the centre of an imaginary Gaussian surface. Find flux through curved surface.
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
gausss-law
difficult
asked
Jan 13, 2014
by
meena.p
1
answer
Electric field intensity due to a semi- infinite wire at a point A as shown is :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
continuous-charge-distribution
difficult
asked
Jan 13, 2014
by
meena.p
1
answer
In the circuit given below, the position of switch S is shifted from 1 to 2 . choose the correct statement
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
combination-of-capacitors
difficult
asked
Jan 10, 2014
by
meena.p
1
answer
A thin metal sheet is placed between the plates of a parallel plate capacitor. Its capacitance will
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
parallel-plate-capacitor
medium
asked
Jan 10, 2014
by
meena.p
1
answer
Potential difference between points A and B is 5V, then voltage across $2 \mu F$ capacitor is :
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
combination-of-capacitors
difficult
asked
Jan 10, 2014
by
meena.p
1
answer
Three identical metal plates are kept parallel to one another at seperation $d_1\; and\; d_2 $ If both the outer plates are connected to ground and middle plate is given charge q, The charge on right side of middle plate will be :
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
parallel-plate-capacitors
medium
asked
Jan 10, 2014
by
meena.p
1
answer
A charged particle moves in a circle around an infinite line charge such that center of circle lies on line and line is perpendicular to plane of circle. If r is the radius of circle the velocity of particle will depend on which power of r .
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
continuous-charge-distribution
medium
asked
Jan 10, 2014
by
meena.p
1
answer
A conducting spherical shell is earthed. A +ve charge $+q_1$ is placed at its centre and another +ve charge $+q_2$ is placed outside at a distance d from centre . If the conducting spherical shell is not earthed , then force on $q_2$ is:
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
medium
asked
Jan 10, 2014
by
meena.p
1
answer
A conducting spherical shell is earthed. A +ve charge $+q_1$ is placed at its centre and another +ve charge $+q_2$ is placed outside at a distance d from centre . If the effect of induced charge due to $q_2$ on sphere is ignored. Then coulomb force on $q_2$
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
medium
asked
Jan 10, 2014
by
meena.p
1
answer
A charge particle of mass 1 kg and charge $ 1 \mu c$ is projected from horizontal ground at an angle $ \theta=45^{\circ}$ with speed $10 ms^{-1}$. In space a horizontal electric field towards the direction of projection $E= 10^{7}NC^{-1}$ exists. The range of projectile is :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
medium
asked
Jan 10, 2014
by
meena.p
1
answer
A charge Q is placed at a distance $D( > R)$ above the centre of disk of radius R The magnitude of flux through disk is $\phi$ . Now a hemispherical shell of radius R is put above the disk to form a closed surface. The flux through the closed surface, if direction of area vector along outward normal is +ve, is :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
gausss-law
medium
asked
Jan 10, 2014
by
meena.p
1
answer
Two infinite long parallel wires having linear charge densities $\lambda_1\; and\; \lambda_2 $ respectively are placed at a distance R. The force per unit length on wire (1) will be:
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
continuous-charge-distribution
medium
asked
Jan 10, 2014
by
meena.p
1
answer
Find the equivalent capacitance between A ans B ,each capacitor having capacitance C.
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
combination-of-capacitors
medium
asked
Jan 10, 2014
by
meena.p
1
answer
If a dielectric slab is inserted in between a capacitor of capacitance C after charging it to a potential V, the net charge on surfaces shown below will be :
jeemain
physics
class12
unit11
electrostatics
medium
asked
Jan 10, 2014
by
meena.p
1
answer
If a point charge is placed at the centre of closed cylindrical conductor of length l and radius R. the flux through the cylinder will be :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-flux-and-dipole
medium
asked
Jan 9, 2014
by
meena.p
1
answer
A circular ring of radius R has charge Q distributed uniformly on it. If a space of radius R, has its centre lying on boundary of the ring, then flux coming out of sphere will be :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
gausss-law
medium
asked
Jan 9, 2014
by
meena.p
1
answer
An infinite long semicircular tube is given as shown below one half is given a surface charge density $+\sigma$ and other half is given charge density $-,\sigma $ . Electric field at a point on axis would be
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
continuous-charge-distribution
difficult
asked
Jan 9, 2014
by
meena.p
1
answer
Mark the correct statements :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-charge
medium
asked
Jan 9, 2014
by
meena.p
1
answer
The correct statement for the phenomenon of "Electrostatic Induction " is :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-charge
medium
asked
Jan 9, 2014
by
meena.p
1
answer
A metal sphere of radius $r_1$ is charged to potential $V_1$ and enclosed in thin spherical shell. If metal sphere is connected to shell by a conductor the potential of shell will be :
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
medium
asked
Jan 8, 2014
by
meena.p
1
answer
Capacitors $C1$ and $C2$ are joined as shown below. If potential at point A i $V_A$ and point B is $V_B$, Potential at point C is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
combination-of-capacitors
medium
asked
Jan 8, 2014
by
meena.p
1
answer
The capacitance of capacitors of plate area $A_2 and A_1 (A_2 < A_1) $ at a distance l is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
parallel-plate-capacitor
medium
asked
Jan 8, 2014
by
meena.p
1
answer
If electric field $\overrightarrow {E} =( y \hat i + x \hat j ),$ the potential field is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
medium
asked
Jan 8, 2014
by
meena.p
1
answer
Capacitance of capacitor becomes $\large\frac{4}{3}$ times its original value if a dielectric slab of thickness $\large\frac{d}{2}$ is inserted b/w the plates (d= seperation between the plates) . The dielectric constant of the slab is:
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
effect-of-dielectric-on-capacitance
medium
asked
Jan 8, 2014
by
meena.p
1
answer
If two conducting spheres are seperately charged and then brought in contact
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
medium
asked
Jan 8, 2014
by
meena.p
1
answer
Charge Q is given displacement $ \overrightarrow {r} = a\hat i + b \hat j $ in electric field $\overrightarrow {E}= E_1 \hat i +E_2 \hat j . $ work done is :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
medium
asked
Jan 8, 2014
by
meena.p
1
answer
The electric potential V at any point (x,y,z) in space is given by $V= gx^2\; volt$. Electric field at $ (2,0,5) m $ in $Vm^{-1}$ is :
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
medium
asked
Jan 8, 2014
by
meena.p
1
answer
In one gram solid, there are $10^{22}$ atoms. If one electron is removed from each one of $0.01 \%$ of atoms the charge gained by solid would be :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-charge
medium
asked
Jan 8, 2014
by
meena.p
1
answer
What is effective capacitance between A and B
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
combination-of-capacitors
easy
asked
Jan 8, 2014
by
meena.p
1
answer
A conductor having a cavity is given a positive charge. What are field strengths $E_A,E_B$ and $E_C$ at point A (inside the cavity), B (with in conductor but outside cavity ) and C (outside the conductor ) respectively ?
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
easy
asked
Jan 8, 2014
by
meena.p
1
answer
Choose the correct option : If the point charge is located inside a spherical gaussian surface away from its centre.
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field-and-dipole
easy
asked
Jan 8, 2014
by
meena.p
1
answer
A charge q is placed at centre of cube of side l. The electric flux through one face of cube will be :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
gausss-law
easy
asked
Jan 8, 2014
by
meena.p
1
answer
125 drops of water of same radius and same charge combine to form a big drop. Ration of potential of big drop to the potential of small drop.
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
medium
asked
Jan 8, 2014
by
meena.p
1
answer
In that below diagram $C_1= 4 \mu F, C_2 =12 \mu F, C_3=8 \mu F$ Energy consumed in charging these capacitors is :
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
combination-of-capacitors
medium
asked
Jan 8, 2014
by
meena.p
1
answer
A charge Q and another charge q are placed at two points A and B which are distance l apart. Keeping q stationary at B, Q is moved to point C such that ABC forms equilateral triangle of side l. Find the net work done ?
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
equipotential-surfaces
easy
asked
Jan 8, 2014
by
meena.p
1
answer
A hollow conducting sphere of radius R has a charge $+Q$ as its outer surface. Inside the sphere at $r= \large\frac{R}{4}$ from its centre the value of electric potential will be :
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential-energy
easy
asked
Jan 8, 2014
by
meena.p
1
answer
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