Recent questions in Physics

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 :

asked Jan 8, 2014 by meena.p

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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

asked Jan 8, 2014 by meena.p

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The capacitance of capacitors of plate area $A_2 and A_1 (A_2 < A_1) $ at a distance l is

asked Jan 8, 2014 by meena.p

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If electric field $\overrightarrow {E} =( y \hat i + x \hat j ),$ the potential field is

asked Jan 8, 2014 by meena.p

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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:

asked Jan 8, 2014 by meena.p

1 answer

If two conducting spheres are seperately charged and then brought in contact

asked Jan 8, 2014 by meena.p

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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 :

asked Jan 8, 2014 by meena.p

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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 :

asked Jan 8, 2014 by meena.p

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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 :

asked Jan 8, 2014 by meena.p

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What is effective capacitance between A and B

asked Jan 8, 2014 by meena.p

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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 ?

asked Jan 8, 2014 by meena.p

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Choose the correct option : If the point charge is located inside a spherical gaussian surface away from its centre.

asked Jan 8, 2014 by meena.p

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A charge q is placed at centre of cube of side l. The electric flux through one face of cube will be :

asked Jan 8, 2014 by meena.p

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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.

asked Jan 8, 2014 by meena.p

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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 :

asked Jan 8, 2014 by meena.p

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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 ?

asked Jan 8, 2014 by meena.p

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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 :

asked Jan 8, 2014 by meena.p

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Three charges Q, +q ans +q are placed at vertices of equilateral triangle. If total electric potential energy of system is zero, the value of Q will be :

asked Jan 8, 2014 by meena.p

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Charges +q and -q are placed on vertices B and C of isosceles triangle. The potential at vertex A is :

asked Jan 8, 2014 by meena.p

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The capacitors A and B are connected in series with a battery. When S is closed two capacitor gets fully charged , then :

asked Jan 8, 2014 by meena.p

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If $E_e$ be the electric field strength of a short dipole at a point on the equitorial line and $ E_a$ be that on axial line at same distance then :

asked Jan 6, 2014 by meena.p

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16 dipoles of charge of magnitude e are placed inside a cube. The total electric flux coming out of the cube will be :

asked Jan 6, 2014 by meena.p

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An alpha particle is accelerated by a potential difference of $10^7 V$. Its kinetic energy will be

asked Jan 6, 2014 by meena.p

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A $20 \mu F$ capacitor and $ 40 \; \mu F$ capacitor are connected in series across $400\; V$ supply line. The charged capacitors are then disconnected from the line and reconnected with their positive plates together and negative plates together. No external voltage is applied. What is potential difference across each capacitor .

asked Jan 6, 2014 by meena.p

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A dielectric slab is introduced just to fill up the space between plates of parallel plate capacitor. The capacitor is charged and then disconnected . The slab is then slowly drown out . The plot of potential difference across the plates and length of dielectric slab drawn out looks like :

asked Jan 6, 2014 by meena.p

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Choose incorrect statement : When two identical capacitors are charged individually to different potential, and connected to each other after disconnecting them from source .

asked Jan 6, 2014 by meena.p

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An uncharged capacitor is connected to a battery. On charging the capacitor :

asked Jan 6, 2014 by meena.p

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A capacitor is charged to $3200 V$ and then connected across a resistor of resistance R. If after 1 s potential difference across capacitor is 2400 V, What will be the potential difference across after 2 and 3 seconds .

asked Jan 6, 2014 by meena.p

1 answer

Two equal and opposite charges $ 8 \times 10^{-8} C$ are placed $ 2 \times 10^{-2} $ cm away from a dipole . If this dipole is placed in an external electric field $2 \times 10^8 N/C$. the value of maximum torque and work done in rotating through $180^{\circ}$ will be :

asked Jan 6, 2014 by meena.p

1 answer

Region surrounding electric dipole

asked Jan 6, 2014 by meena.p

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The capacitance of parallel plate capacitor does not depend upon

asked Jan 6, 2014 by meena.p

3 answers

If a charge q is rotated around charge Q in a circle of radius y by $90^{\circ}$, the work done will be

asked Jan 6, 2014 by meena.p

1 answer

Find the equivalent capacitance :

asked Jan 6, 2014 by meena.p

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Equivalent capacity of parallel plate capacitor shown below is :

asked Jan 6, 2014 by meena.p

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In the circuit shown below ; if 2000 v potential is given to point A, the potential at point B is :

asked Jan 6, 2014 by meena.p

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The plates of parallel plate capacitor of capacity $ 100 \mu F$ are charged to potential $100 v $and then seperated from each other so that distance between them is doubled. How much energy is spent in doing so ?

asked Jan 6, 2014 by meena.p

1 answer

A parallel plate capacitor of plate area A, plate seperation d is charged potential difference V. The battery is then removed and a slab of dielectric constant k is inserted between plates of capacitor. If $Q,\in $ and $w$ denotes charge , electric field (after slab is inserted ) and work done on the system in process of inserting the slab, the incorrect relation is :

asked Jan 3, 2014 by meena.p

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A change A is divided into two parts: q and Q-q. if Coulomb repulsion between them when they are separated is maximum , $\large\frac{Q}{Q-q}$ should be :

asked Jan 3, 2014 by meena.p

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To obtain $6 \mu F $ capacity from $3$ capacitors of $4 \mu F$ each, they will be arranged as :

asked Jan 3, 2014 by meena.p

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The electric potential as a function of distance x is given by $ V= (-5x ^2-10 x +9) \;volt$ . The electric field at point $(1,2)$ is

asked Jan 3, 2014 by meena.p

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A charge q is placed at middle point of the line joining two equal charges +Q. The value of q such that system is in equilibrium is :

asked Jan 3, 2014 by meena.p

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A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 25 V. The electric field at centre of sphere is :

asked Jan 3, 2014 by meena.p

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Two small spherical balls whose charges are $20 \mu c$ each are hanged with help of 1 m long thread from roof. In equilibrium both threads are seperated by $ 60^{\circ}$ Tension in each thread is :

asked Jan 3, 2014 by meena.p

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A $0.4 \mu F$ capacitor is charged to $1200 v. $ After removing battery a $0.2 \mu F$ capacitor is connected in parallel to it. The voltage on capacitor will become :

asked Jan 3, 2014 by meena.p

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Electric potential at any point is $V=-10 x +6y +\sqrt {60 }z$, then magnitude of electric field is :

asked Jan 3, 2014 by meena.p

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If capacitor is changed from 0 to 20 v using constant current. Variation in energy U of capacitor with time t will be

asked Jan 3, 2014 by meena.p

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All the capacitors shown in circuit are identical . Each can withstand maximum $100 V$ between its terminals . The maximum voltage that can be applied safely b/w A and B is

asked Jan 3, 2014 by meena.p

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Two metal balls of same radii are charged to 5 and -25 units of electricity . They are brought in contact with each other and then again seperated to original distance. Ratio of magnitude of force b/w two balls after and before contact is

asked Jan 3, 2014 by meena.p

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In a medium of dielectric constant K, the electric field is $\overrightarrow {E}$, if $\in _0$ is permittivity of free space , the electric displacement vector is :

asked Jan 3, 2014 by meena.p

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Potential of any point inside a charged hollow sphere :

asked Jan 3, 2014 by meena.p

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