Recently Active Electricity And Magnetism Questions

Ques 1) If excess charge is placed on a spherical shell that is made up of conducting material, then the excess charge spreads uniformly over the external surface. Is this true in case if the shell is made up of NON CONDUCTIN ...

Have you ever observed that a pendulum clock(normal household clock) oscillates continuously even air friction is acting opposite to the direction of its motion. it oscillates due to the force of repulsion between two magnets ...

We know that electric current is not a vector. Then in Kirchoff's law,why do we take negative value of current from our calculations to have a direction opposite to the assumed direction? ...

Q.) 3 insulated conducting spheres A, B and C of radii a, b, c respectively (a<b<c) has charges q1, q2, q3 respectively. Find their- (i) potentials (ii) the reduction in the potential of the outermost sphere when the in ...

well i had some doubts.......... the first one isn't really a study doubt....its a general query that came to my mind while reading abt the earth's magnetism.. as we know that the earth reverses both the magnitude as well as ...

electrically charged drops of mercury fall from altitude h into a spherical metal vessel of radius R. in the upper part of which there is a small opening. The mass of each drop is m & charge is Q.What is the number 'n' of las ...

In NCERT books,it is written that electron was discovered in 1859. Ohm's law was given before 1854 because Ohm died in 1854 and Coulomb' law was given before 1806 because coulomb died in 1806.We know that electron flow is kno ...

1)Can anybody please explain me the various methods for finding the equivalent resistence in a given ckt.m having a lil bit prob in this .....i just only noe the simple methods like of pointing out the same potential points,K ...

the last post i posted was wrong due to my superb english on net n my failure to reply due to my xams so now whenever we calculate magnetic field due to a solenoid or a wire from amperes law or the same by gaus law for differ ...

we say that conductors r called so coz they have lot of free electrons , which r generated coz in conductors electrons r loosely held and in insulators they r tightly held so no free electrons........ my quesn is that why is ...

hc verma magnetic field due 2 current ques:5 &6 .plzzzz anyone hlp............. urgent;;;; ...

if we say tht an electron consist of two parts then each part will be having -ve charge so they must repel each other.....so the electron must break in those parts but this not in real then which force does keep the parts of ...

A semicircular ring of mass m is kept in x-y plane with centre at origin.It is charged in such a way such that charge/unit length varies as λ=λocosθ . Find accelration of ring when electric field E=Eoxi+Eoj is switched on. ...

1.) Two +ve charges Q and 4Q are fixed at distance 12cm. Sketch lines of force and locate null point. 2.) Two point charges q and 4q are kept at a distance r from each other. While showing electric line plot indicate the neut ...

Hey friends plz help me in this....... I want to clear my concept........ What will be the Eq. resistance b/w the points A and B.... Each resistance in the circuit is equal to 5 Ω *Image* According to CBSE syllabus...... Req ...

Hey...guys..... can neone plz help me..... i am totally confused abt this concept of charging nd discharging of the capacitors.... what does the term Q = Q0 e-t/RC represent ???? same is the case for current , power, energy a ...

Can you friends plz help me in this...... All resistances are equal to RΩ. Calculate the effective resistance b/w A and B. *Image* ...

*Image* Consider the situation shown in the figure. the capacitor A has a charge q on it whereas B is uncharged. What amount of charge will appear on the capacitor B a long time after the switch S is closed: (A) zero (B) q/2 ...

Energy is stored in : a) positive plate of the capacitor b) negative plate of the capacitor c) both the plates of the capacitor d) none ...

http://www.allaboutcircuits.com/vol_1/chpt_10/13.html I have resisted a lot in the past against this method. I really feel that this method takes away the joy of solving complex circuits and should be studied only at an engin ...

A Particle P has a mass of 10mg and a charge of -0.01 µC. Each plate has a surface area 100cm2 on one side. What potential difference V should be applied to the combination to hold the particle P in equilibrium? *Image* ...

Can anyone tell what is the direction of electric field on the surface of the conductor..... Is it Radial or tangential???????????? ...

A spherical capacitor has inner and outer radius a,b respectively.The space is suddenly filed with a medium of dielectric constant k=1.The charge on inner plate is +q,outer plate -q.Suddenly,the medium becomes conducting with ...

Everyone of you might have read that the electric field inside the conductor is 0 as the free electrons migrate to the surface of the conductor..... but how does the electric current exist inside the conductor. Electric curre ...

A curious phenomenon was observed by an experimenter working with a very sensitive galvanometer while sitting on a chair at a table. The galvanometer was secured on a wall and its ends of its winding were connected to an open ...

actually its not a question it something hat i hv thought over for a long time..... we generally assume in guasss law that electric field is symmetric like a pnt charge that can be easily proved now lets try to find the elect ...

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*Image* the two plates of a capacitor with capacitance C is given q1 and q2 charge,,the system is as shown where R is resistance..the key is closed at t=0 find charges on the plates after time t. ...

Q.) 3 small balls each of mass 1gm are suspended separately from a common point by silk thread each 1m long. The balls are identically charged and are located at the corners of an equilateral triangle of side length 3cm. What ...

*Image* yeah so my doubt... magnetic field= weber/squared metre thus weber must be the unit of NUMBER of field lines but then since weber signifies number of field lines, it must be dimensionless.. giving field's dimension as ...