Recent questions in Physics

The potential difference across the terminals of a battery is 10V when there is a current of 3A in the battery from the negative to the positive terminal. When the current is 2A in the reverse direction, the potential difference becomes 15V. The internal resistance of battery is

asked Feb 6, 2014 by thanvigandhi_1

1 answer

Which of the following has the maximum resistance?

asked Feb 6, 2014 by thanvigandhi_1

1 answer

Two identical batteries having emf 2.4 V and internal resistance 0.5$ \Omega$ are connected as shown. Potential Difference between A and B is

asked Feb 6, 2014 by thanvigandhi_1

1 answer

Current through the 2$ \Omega$ resistor is

asked Feb 6, 2014 by thanvigandhi_1

1 answer

A piece of copper and another of silicon are cooled from room temperature to 75K. The resistance of

asked Feb 6, 2014 by thanvigandhi_1

1 answer

A charge Q is placed at a distance $\;\large\frac{a}{2}\;$ above the centre of a horizontal , square surface of edge a as shown in figure . Find the flux of the electric field through the square surface

asked Feb 6, 2014 by yamini.v

1 answer

Calculate the potential energy of the system shown in figure

asked Feb 6, 2014 by yamini.v

1 answer

An infinite number of charges each numerically equal to q and of the same sign are placed along the x-axis at $\;x=1 ,2 ,4 ,8----\;.$ Find elctric potential at $\;x=0$

asked Feb 6, 2014 by yamini.v

1 answer

Two point charges $\;q_{1}$ and $\;q_{2}$ are placed at a certain distance d from each other . The interacting force between them is F . Now both charges kept in oil of relative permittivity 5 . What is the new value of force between them

asked Feb 6, 2014 by yamini.v

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At a certain distance from a point charge , the field intensity is $\;500 V/m\;$ and the potential is 1500 V . The magnitude of charge is

asked Feb 6, 2014 by yamini.v

1 answer

An electrical charge $\;4\times10^{-8} C\;$ is placed at the point $\;(2 ,3 ,5)\;.$ At the point $\;(5 , 3, 1) m \;$ electric field vector will be

asked Feb 6, 2014 by yamini.v

1 answer

If the potential at the centre of a uniformly charged hollow sphere of radius R is V then electric field at a distance r from the centre of sphere will be $\;(r > R)$

asked Feb 6, 2014 by yamini.v

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Find the magnitude of net electric field at the centre of square having charges arranged as shown in figure

asked Feb 6, 2014 by yamini.v

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The potential at a point x due to some charges situated on the x- axis is given by $\;V (x) = \large\frac{20}{(x^2-4)} volt\;$. The electric field at x = 4m is given by

asked Feb 6, 2014 by yamini.v

1 answer

A charge particle 'q' is shot towards another charged particle 'Q' which is fixed , with a speed 'v'.It approaches 'Q' upto a closest distance r and then returns . If q were given a speed of '2v' the closest distance of approach would be

asked Feb 6, 2014 by yamini.v

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Charge Q is given a displacement $\;\overrightarrow{r}=a \hat{i} + b \hat{j}\;$ in an electric field $\;\overrightarrow{E}=E_{1} \hat{i} + E_{2} \hat{j}\;.$ The work done is

asked Feb 6, 2014 by yamini.v

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Two thin wire rings each having radius R are placed at a distance d apart with their axes coinciding . The charges on the two rings are +Q and -Q .The potential difference between the centres of the two rings is

asked Feb 6, 2014 by yamini.v

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There is an electric field E in x - direction . If the work done on moving a charge of 0.2C through a distance of 2m along a line making an angle $\;60_{0}\;$ with x - axis is 4J . What is value of E

asked Feb 6, 2014 by yamini.v

1 answer

A charged particle of mass 100g and charge $\;10^{-3} C\;$ is suspended through a thread . A horizontal electric field $\; E=\sqrt{3}\times10^{3} NC^{-1}\;$ exists in region . Find the angle made by thread with verticle .

asked Feb 6, 2014 by yamini.v

1 answer

Which of the following does not represent Charle's law?

asked Feb 5, 2014 by balaji

1 answer

Which of the following does not represent Boyle's law?

asked Feb 5, 2014 by balaji

3 answers

An oxide of nitrogen at NTP has a density equal to another oxide of Nitrogen at $12^{\circ}$. If we consider pressure conditions to be the same, what are the two oxides involved?

asked Feb 5, 2014 by balaji

1 answer

In the adjoining infinite circuit, what is the effective resistance as seen by the battery

asked Feb 5, 2014 by thanvigandhi_1

1 answer

At $0^{\circ}$, the density of carbon-di-oxide is the same as that of an oxide of nitrogen. The oxide of nitrogen is which of the following, considering the pressure conditions to be the same?

asked Feb 5, 2014 by balaji

1 answer

In a closed container, if we increase the temperature of the vessel, the pressure also increases due to:

asked Feb 5, 2014 by balaji

1 answer

A charge Q is to be divided on two objects . What should be the values of the charges on the objects so that the force between the objects can be maximum

asked Feb 5, 2014 by yamini.v

1 answer

According to Maxwell's distribution of velocities, with an increase in temperature, which of the following is true?

asked Feb 5, 2014 by balaji

1 answer

To double the full scale reading of any galvanometer turned into a voltmeter, you must

asked Feb 5, 2014 by thanvigandhi_1

1 answer

The electric field in a region is radially outward with magnitude $E=A\;r\;$ . Find the charge contained in a sphere of radius a centered at the origin . Take $\;A=90\;Vm^{-2}\;$ and $\;a = 2m\;$

asked Feb 5, 2014 by yamini.v

1 answer

The value of each of the resistors is R. The equivalent resistance between A and B is

asked Feb 5, 2014 by thanvigandhi_1

1 answer

A thin metallic spherical shell contains a charge Q on it . A point charge q is placed at the centre of the shell and another charge $\;q_{1}\;$ is placed outside it as shown in figure . All the three charges are +ve . The force on the charge at centre is

asked Feb 5, 2014 by yamini.v

1 answer

Two identical particles , each having a charge of $\;2\times10^{-4}\;C\;$ and mass 10g are kept at a separation of 10 cm and released . What would be the speeds of the particles when the separation becomes large ?

asked Feb 5, 2014 by yamini.v

2 answers

A particle having a charge of $\;2 \mu C\;$ is placed directly below and at a separation of 10 cm from the bob of a simple pendulum at rest . What charge should the bob be given so that the string becomes loose ? mass of the bob is 1 kg .

asked Feb 5, 2014 by yamini.v

1 answer

The electric field and the electric potential at a point are E and V respectively

asked Feb 5, 2014 by yamini.v

1 answer

A point charge q is rotated along a circle in the electric field generated by another point charge Q . The work done by the electric field on the rotating charge in one complete revolution is

asked Feb 5, 2014 by yamini.v

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Two charged particles having charge $\;2.0\times10^{-8}\;C\;$ each are joined by an insulating string of length 1m and the system is kept on smooth horizontal table . Find the tension in the string

asked Feb 5, 2014 by yamini.v

1 answer

Electric potential has the dimensions of

asked Feb 5, 2014 by yamini.v

1 answer

Electric potential on the surface of a solid sphere of radius R is V . Then potential at $\;r=\large\frac{R}{2}\;$ is

asked Feb 5, 2014 by yamini.v

1 answer

A charge Q is placed at each of the two opposite corners of a square . A charge q is placed at each of the other two corners . If the resultant force on each charge q is zero , then

asked Feb 5, 2014 by yamini.v

1 answer

Four charges q , -q , q , -q are placed in order on the four consecutive corners of a square of side a . The work done in interchanging the positions of any two neighbouring charges of the opposite sign is

asked Feb 5, 2014 by yamini.v

1 answer

The electric field in a region is given by $\;\overrightarrow{E}=\large\frac{\in_{0} x \hat{i}}{l}\;.$ Find the charge contained inside a cubical volume bounded by the surfaces $\;x=0 , x=a , y=0 , y=a , z=0 , z=a $ where $a= 10^{-2} m$ and $l= 2 \times 10^{-2}\; m$

asked Feb 5, 2014 by yamini.v

1 answer

A point charge Q is located on the axis of a disc is radius R at a distance b from the plane of the disc . Find the electric flux through the disc if R= $\;\sqrt{3}\;b$

asked Feb 5, 2014 by yamini.v

1 answer

The electrical potential existing in space is $\;V\;(x , y, z) = A\;(xy+yz+zx)\;$ . Find the expression for the electric field

asked Feb 5, 2014 by yamini.v

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A particle with kinetic energy $\;10\;MeV\;$ and charge $\;4e\;$ is heading towards a stationary nucleus of atomic number 100 . Calculate the distance of closest approach ?

asked Feb 4, 2014 by yamini.v

1 answer

A charged particle of mass $\;m= 1 kg\;$ and charge $\;q=2\;\mu C\;$ is thrown from a horizontal ground at an angle $\;\theta=45^{0}\;$ with speed $\;20\;m/s\;.$ In space a horizontal electric field $E=2\times10^{6}\;V/m\;$ exist Find the range on horizontal ground of the projectile

asked Feb 4, 2014 by yamini.v

1 answer

A charge q is distributed uniformly on the surface of a sphere of radius R . It is covered by a concentric hollow conducting sphere of radius 2R . Find the charges on the outer surface of hollow sphere if it is earthed

asked Feb 4, 2014 by yamini.v

1 answer

Find the potential on the edge of a disc of charge density $\;\sigma$ and radius $R$

asked Feb 4, 2014 by yamini.v

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A disc having a uniform charge density $\;\sigma\;$ and radius $\;R\;$ is placed on $\;x-y\;$ plane with centre at the origin . Find the electric potential at a point on z - axis at a distance $\;10 m\;$ from centre . $\;\sigma=16\;\in_{0}\;,R=1 m$

asked Feb 4, 2014 by yamini.v

1 answer

Two point charges $\;q_{1}=q_{2}=2\;\mu C\;$ are fixed at $\;x_{1}= +3m \;and\;x_{2}=-3m\;$ as shown in figure . A third particle of mass 1g and charge $\;q_{3}=-4\;\mu C\;$ are released from rest at $\;y=4m \;$. Find the speed of the particle as it reaches the origin .

asked Feb 4, 2014 by yamini.v

1 answer

The electric field in a region is given by $\;\overrightarrow{E}=\alpha\;x^2 \hat{i}\; $ Here $\;\alpha\;$ is a constant of proper dimensions . Find the total flux passing through a cube bounded by the surfaces . $x=l\;,x=2l\;,y=0\;,y=-l\;,z=0\;,z=l\;.$

asked Feb 4, 2014 by yamini.v

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