Recently Active Physics Questions

When there is 1 pos. & 1 neg. charge we are sure that the dir. of the electric field is from (+)ve to (-)ve.. But when both are positive or both are negative how exactly do we find the direction ?? ...

Consider a uniforml charged ring of radius R. Find the point on the axis where the electric field is max ? ...

*Image* Q.1 find the workdone in moving a point charge 2nC frm A to B , if y=6 cm , x= 8cm , q1= 20/3 , q2= -20/3. Q.2 three identical metal plates with large surface areas r kept parallel to each other as shown. the leftmost ...

two wires carrying current may attract each other .in absence of other forces they ll move towards each other wid increasing kinetic energy.does it contradict wid the fact ttht magnetic field does no wrk n hence cant increase ...

consider a long,straight wire of cross section a carrying current i .let there be n free electrons per unit volume .an observer places himself on a trolley moving in direction opposite to current with a speedv=i/nAe n separat ...

a charged metal sphere with potential V and radius r is enveloped by a thin walled conduction spherical shell of radius R . The potential of the sphere after it has been connected for a short time to shell by a conductor will ...

There are two tanks of same height h3, and pressure in both the tanks are maintained at p1 and p2 respectively, where the liquids are filled upto h1 and h3., there is a pipe connecting the two tanks from which the liquid come ...

a charge q is distributed uniformly throughout a non conducting shperical volume of radius R. show that the potential at a dist. a frm the centre where a < R , is given by V = q(3R2 - a2)/8πεo R3 ...

there are two concentric bodies of same mass one sphere of radius R and other concentric shell with radii R . the outer shell has a tiny hole in it so that samll particle can penetrate it . A small particle of mass m is relea ...

A rope of length L and mass M is being pulled on a rough horizontal floor by a constant horizantal force F=Mg.The force is acting at one nd of the rope in the same direction as the length of the rope .Te coefficient of kineti ...

a non conducting ring of radius 0.5 m carries a total charge of 1.11*10-10 C distributed non uniformly on it's circumference producing electric field E vector everywhere in the space . the value of the line integral ∫ -E. d ...

A particle moves along the x axis, so that its potential energy U depends on its position coordinate x as U(x)=A|x|^n where A is a positive real and n>0. How will the time period of oscillations depend on the total mechani ...

*Image* three identical parallel conducting plates A,B and C are placed as shown . switches are connected to A and C which can connect them to the earth if closed. +q charge is given to B . please consider the following optio ...

the extension in a string obeying hooke s law is x .the speed of sound in stretched string is v .if extension is increased to 1.5 x then speed of sound ll be a)1.22v b).61v c)1.5v d)o.75v ...

CAN ANYONE PLEASE TELL ME IN PLAIN WORDS (=> NO LINKS, PLEASE) WHAT A THERMOCOUPLE IS??? ...

please explain with reasons *Image* ...

A particle is moving with a velocity \overrightarrow{\mathbf{v}_0} when starting at t=0, a constant force starts to act on it. As a result, at t=t0, its speed becomes \dfrac{v_0}{2} , and at t=2t0, its speed becomes \dfrac{v_ ...

Take a system of two conductors of any shape and size with charges Q1 and Q2 and potentials V1 and V2.Let q be the charge that would flow from the conductor when they are shorted.Prove that the quantity q/(V1-V2) is a constan ...

A spherical ball in hung in a string of length l and is kept in a car moving wid a velocity v. The car suddenly stops and the ball moves in a circular path. If T is the tension @ the highest pt. is twice the wt. of the ball, ...

we know viscous force is 6 (pi)nrv so do we ve viscous force acting b/w layers even if there is no relative motion ...

q if a deforming force is applied to the rubber n it is suddenly removed wat ll happen to energy /ll it be absorbed or released while regaining its shape (rubber is perfectly elastic) ...

q1 when a glass capilliary tube is dipped at one end of the water .water rises in the tube .the gravitational potential energy is increased .is it a violation of conservation of energy? q2 if a mosquito is dipped in water n r ...

in case of a soap film it s said tht surface tension act at exactly two surfaces cud someone elaborate this thing . i m unable to visualize the things ...

when a metal wire elongates by hanging a load on it , the gravitational potential is decreased then a)this energy completely appears as increased kinetic energy of the block b)this energy completely appears as incresed potent ...

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the contact angle b/w pure water n pure silver is90°if capillary tube made of silver is dipped at one end in pure water ,llwater rise in capilliary ...

A particle is initially situated at origin . It starts moving with a velocity v towards right .During motion a force F always acts on the body towards left . given coefficient of friction μ , find the time taken by particle ...

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an interstellar explorer discovers a remarkable planet made entirely of uniform compressible fluid of density ρ.the radius of the planet is `r` and the gravity at its surface is `g`. wats the pressure at the centre of the pl ...

Each of the two long parallel threads carries a uniform charge λ per unit length. The threads are separated by a distane l. Find the maximum magnitude of the electric field strength in the symmetry plane of this system locat ...