Recent questions in Electric Charges and Fields

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:

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 $q_2$

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 :

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 :

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:

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 :

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 :

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 :

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

asked Jan 9, 2014 by meena.p

1 answer

Mark the correct statements :

asked Jan 9, 2014 by meena.p

1 answer

The correct statement for the phenomenon of "Electrostatic Induction " is :

asked Jan 9, 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 :

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 :

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 ?

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.

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 :

asked Jan 8, 2014 by meena.p

1 answer

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

1 answer

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

1 answer

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

1 answer

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

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

A force F acts between two charges kept 1 cm apart in air. If permittivity of air and dielectric constant of water are $\in _0$ and $K$ respectively, find the force acting when both atoms are placed in water.

asked Jan 3, 2014 by meena.p

1 answer

Total electric flux coming out of unit positive charge put in air is :

asked Jan 3, 2014 by meena.p

1 answer

Two plates are 5 cm apart, a potential difference of 10V is applied between them. What is the electric field between the plates?

asked Dec 20, 2013 by balaji.thirumalai

1 answer

If three equal charges are placed on three corners of square and force between $q_1$ and $q_2$ is $F_2$, and the force between $q_1$ and $q_2$ is $F_3$, find $F_3/F_2$

asked Dec 20, 2013 by balaji.thirumalai

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