Recent questions tagged medium

The initial value problem governing the current i following in an RL circuit when a step voltage of magnitude $\in$ is applied to circuit at $t=0$ is given by (R, L, t are constants ) $iR= \large\frac{Ldi}{dt} $$=\in, t > 0, i(0)=0$ Determine limiting value of i as $t \to \infty$

asked Feb 6, 2014 by meena.p

1 answer

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

Find the length of lactus Rectum for the parabola $y^2=4ax$?

asked Feb 6, 2014 by sreemathi.v

1 answer

A ratio active substance dis integrals at a rate proportional to amount of substance present. $50 \%$ of amount disintegrates in $1000$ years. Approximately what $\%$ of substance will disintegrate in $50$ years ?

asked Feb 6, 2014 by meena.p

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

1 answer

Find the area of triangle by tangents at the point $P(at_1^2,2at_1)$ & $Q(at_2^2,2at_2)$ for the parabola $y^2=4ax$ .

asked Feb 6, 2014 by sreemathi.v

1 answer

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

1 answer

Find the point of intersection of tangents at any two points on the parabola $y^2=4ax$?

asked Feb 6, 2014 by sreemathi.v

1 answer

A drop of liquid evaporates at a rate proportional to its area of surface. If the radius initially is $4\;mm$ and $5$ minutes later, the radius is reduced to $2\; mm$, find radius of drop as a function of time ?

asked Feb 6, 2014 by meena.p

1 answer

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

1 answer

Find the point of intersection of normals at any two points on the parabola $y^2=4ax$

asked Feb 6, 2014 by sreemathi.v

1 answer

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

Find the relation between $'t_1'$ meets the parabola again at $'t_2'$ for the parabola $y^2=4ax$?

asked Feb 6, 2014 by sreemathi.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

Show that normal to the parabola $y^2=4x$ at the point (1,2) meet it again at some point of parabola, find the point?

asked Feb 6, 2014 by sreemathi.v

1 answer

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 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

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 degree and order of differential equation of family of parabolas whose length of latus rectum is fixed and axis is x-axis ,are respectively

asked Feb 5, 2014 by meena.p

1 answer

Find the solution : $y (\log x-1) y dx=x dy $

asked Feb 5, 2014 by meena.p

1 answer

The cost of one pair of shows is Rs. 2340. How many pairs of shoes can I buy for Rs. 55,110. How much money will remain, if any for other purchases?

asked Feb 5, 2014 by balaji.thirumalai

0 answers

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

Solution of differential equation $\large\frac{dy}{dx} +\frac{y}{x}$$=x^3 y^5$ is which of the following?

asked Feb 5, 2014 by meena.p

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

Find the conditions for a co-normal point (h,k) of a parabola $y^2=4ax$

asked Feb 5, 2014 by sreemathi.v

1 answer

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

Find the equation of common tangent to the parabola $y^2=4x$ and $x^2=4y$?

asked Feb 5, 2014 by sreemathi.v

1 answer

Find the area of $\Delta ABC$ where AC is focal chord of the parabola $y^2=4ax$ & B is the vertex of parabola $y^2=4ax$?

asked Feb 5, 2014 by sreemathi.v

1 answer

Find the equation of straight line touching both $x^2+y^2=2$ and $y^2=8x$.

asked Feb 5, 2014 by sreemathi.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

1 answer

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

The energy required for the ionisation of a certain atom is $3.44\times10^{-18}J$. The absorption of a photon of unknown wavelength ionises the atom and ejects an electron with velocity $1.03\times10^6$ m/sec. Calculate the wavelength of the incident radiation.

asked Feb 5, 2014 by sharmaaparna1

1 answer

Calculate the wavelength of the first line and the series limit for the Lyman series for hydrogen.(Series limit is for the case when $n_2 = \infty)$

asked Feb 5, 2014 by sharmaaparna1

1 answer

Electric potential has the dimensions of

asked Feb 5, 2014 by yamini.v

1 answer

A proton is accelerated to one tenth of the velocity of light. Suppose velocity can be measured with a precision of $\pm1\%$, what can be the uncertainity in its position?

asked Feb 5, 2014 by sharmaaparna1

1 answer

The speed of a certain proton is $4.5\times10^5m$ If the uncertainity is to be reduced to 0.01percent, what uncertainity in its location must be tolerated?

asked Feb 5, 2014 by sharmaaparna1

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

Find the image of the point $(2,2)$ with respect to the line $x+y+2=0$.

asked Feb 5, 2014 by sreemathi.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

1 answer

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

An open box with square base is to be made of a given quantity of card board of area $ 36 sq.metre.$ Find the maximum volume of the box.

asked Feb 4, 2014 by rvidyagovindarajan_1

1 answer

Find the area bounded by curves $x^2 + (y-1)^2 = 1$ and $x^2 + y^2 = 1$.

asked Feb 4, 2014 by rvidyagovindarajan_1

1 answer

Find the area bounded by curves $(x - 1)^2 + y^2 = 1$ and $x^2 + y^2 = 1.$

asked Feb 4, 2014 by rvidyagovindarajan_1

1 answer

Solve the differential equation $\large\frac{dy}{dx}$$=cos(x+y)+sin(x+y)$ and find the particular solution if $y(0)=0$

asked Feb 4, 2014 by rvidyagovindarajan_1

1 answer

Ask Questions, Get Answers