Popular Electricity And Magnetism Questions

Two identical metallic balls of radius 2 m are placed in a homogenous poorly conducting medium with restivity 4 × 10^-3 m. The distance between them is much larger than their size. The resistance of medium between the balls ...

Q. Is the coulomb force that one charge exerts on the another changes if othere charges are brought nearby? A. No but then..everybody knows that electrostatic force follows ineverse square law....is there any difference betwe ...

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an aluminium wire and tungsten wire are of same length and diameter at 0 C . at what temp .does aluminium wire have a same resistance as tungsten at 20 C . given ρw = (5.6 ). 10 -8 Ω m ρal = (2 . 8 )10 -8 Ω m αw = 4.5 .1 ...

*Image* correct ans are a,c,d. If i ignore the plate Y , the i m getting the answers. I want to know what is the effect of Y. ...

a current carrying wire is curved.hence electrons flowing wold recieve an acceleration.as the electrons are acecelarating would not they radiate energy. ...

1) A wire of length 1m is moving at aspeed 2m/sec perpendicular to a magnetic field of induction of 0.5T.The ends of wires are formed by a circuit of total resistance 6ohm.What is the rate at which work is done to keep the wi ...

Is there any method to find time constant of L-C OR R-C etc circuits?????????????????? ...

A straight wire carries a current of 3 A. Calculate the magnifield of the magnitic field at a point 10 emp. away from the wire. ...

3 inf. planes(A,B,C) have uniform surface charge distribution σ on its surface.All charges are fixed.On each of 3 inf. planes,parallel tp YZ plane placed at x=-1,x=0,x=a.Find potential diff b/w A and C ...

*Image* my doubt since ∫dl=0 why net force is not 0? ...

Statement 1: In a conductor of non- uniform cross-section, the current is same, though the drift velocity is different. Statement 2: In series current is same and for same current drift velocity is inversely proportional to c ...

A disc of mass m ,radius R is shown rolling on horz surface(having sufficient friction). Variation of electric fields with direction exist along its path as shown in figure *Image* charge on disc=Q 1)Find velocity of disc aft ...

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*Image* and ya diatance b/w point A and infinite length wire is L ...

help i hav some doubts in it....des r easy *Image* ...

A non conducting ring(mass m,radious r,having charge Q) is placed on a rough horizontal surface(in a cylindrical region with tranverse magnetic field ).The field is increasing with time at the rate R and the coefficient of fr ...

In which of the following arrengement if we apply 10 volt across A and B the PD across C and D is found to be 7 volt, but when we apply 10 volt across C and D the PD across A and B is found to be 10 volt? *Image* ...

A point charge q is placed at a corner of a cube. Find the flux passing through the cube ? If you are through with the 1st part , try to find out the flux passing through the surface of the above cube which lies opposite to t ...

*Image* A loop of radius a and resistance R uniformly distributed over it is placed perpendicular to a magnetic field B as shown. A rod AB of negligible resistance starts rotating with angular speed w. At t=0, theta = 0. A co ...

A uniformly charged ring of radius 0.1 m with afrequency 104 rps about its axis. The ratio of energy density of electric field to the energy density of magnetic field at a point an the axis at the distance 0.2 m from the cent ...

A co-axial cable is made up of two conductors. The inner conductor is solid and is of radius R1 and the outer conductor is hollow of inner radius R2 and outer radius R3. The space between the conductors is filled with air.The ...

while doing a sum the emf of a battery in a circuit came out to be negative.surprisingly the answer was negative.how is it possible.how is the current flowing then?? ...

A point charge Q is placed at x=k on the x-axis, k>1. There's a conducting sphere at the origin, of radius 1 unit. Find the field at the origin due to induced charges. ...

Does Gauss law for electric flux hold, in case of induced electric field due to time dependent magnetic field in a cylindrical region? Is it the case that Gauss law for flux holds in conservative electric fields only??? a bit ...

yesterday i was seeing the sove papers of nsep and i saw that the equivalent resistance m was asked in one question and it was writtent that equivalent reisstance is when calculated the internal resistance is not added.... is ...

*Image* the cell is ideal. what is th PD across the capacitor?? pleaxe xplain. ...

Two concentric shells are surrounded by a conducting surface as shown in figure. Now the middle shell and outer conducting surface are connected by a conducting wire. What will be charge on surface surrounding the two shells ...

i dont know but i hv this doubt nagging me....... we hv studed that according to gauss law magnetic flux through a closed surface is 0 as no single charge ever exists..... now in electromagentic inudctuion the emf induced is ...

in carnot cycle, one process is isothermal and the other is adiabatic. the isothermal process is meant so that heat doesn't flow irrevesible between the working substance and heat reserviour. then WHAT IS THE USE OF HAVING TH ...