Recently Active Electricity And Magnetism Questions

N identical cells of emf E and internal resistance R are joined in series to form a closed circuit. One cell A is joined with reverse polarity. V across each cell except A is : a) 2E/N b) (N-1)E/N c) NE/(N-1) d) (N-2)E/N ans ...

The charge on a proton in + 1.6 x 10-19 C and thaton an electron is -1.6 x 10-19 C. Does it mean that the electron has a charge 3.2 x 10-19 C less than the charge of the proton ? The ans looks like it is YES,,but i dont think ...

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A large solid sphere with a uniformly distributed positive charge has a smooth narrow tunnel through its centre. A small particle with negative charge, initially at rest far from the sphere, approaches it along the line of th ...

A thin wire of radius r has an electric charge q. What will be the increment of the force stretching the wire if a point charge q0 is placed at the ring's centre ?? Pls explain the question 2.. ...

When a charged comb is brought near a small piece of paper,it attracts the piece . Does the paper become charged when the comb is brought near it ?? ...

Can two equipotential surfaces cut each other ?? Pls explain the question too..i didnt understand ...

d scale of a galvanometer requires of resistance 50Ω contins 25 divisions .on passing a current of 1 division .d resistance dat must b added to it so dat it may become a voltmeter of range 2.5V[ans-200Ω] d resistance of gal ...

Point charges q & -q are located @ the vertices of a square with diagonals 2l as shown in the fig. Find the magnitude of the electric field strength @ a point located symmetrically with respect to the vertices of the sqr. at ...

In some old texts it is mentioned that 4Ï€(pi) lined of force originate from each unit positive charge. Comment on the statement in the view of the fact that 4Ï€ is not an integer. ...

The number of electrons in an insulator is of the same order as the number of electrons in a conductor. What is the basic difference betw. them ?? Should we explain it wid the Forbidden Gap theory or is their any other ans ? ...

1. why is electric flux outside spherical conductor Q/2ε and not Q/ε 2. force exerted on Q1 (given is a spherical shell with charge q distributed uniformly on it and Q1 is at its centre) and a charge q2 some dist away =0 wh ...

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two point charges are kept in space. they exert force on each other the magnitude and direction given by coulomb's law. now, if an infinitely large metallic plate of considerable thickness is placed between the charges, do th ...

A thin nonconducting ring of radius R has a linear charge density λ = λ0 cos φ, where λ0 is a constant, φ is the azimuthal angle. Find the magnitude of the electric field strength on the axis of the ring as a function of ...

*Image* Wats is cap of this figure? ...

a full wave rectifier is fed with ac mains of frequncy 50Hz .wats d fundamental frequncy of d ripple in d output cenetr 50 25 100 75 ...

a half wave rectifier is being used to rectify an alternating voltage of freqncy 50Hz d no of pulses of rectified currt obtained in one sec is 50 25 100 200 fromula ke saath answer do ...

d delpletion region in pn junction diode , d acceptor ions in d p region and d donor ions in d n region give rise to a)potential frm n to p b|)potential frm p to n c)xtraction of amjority charge carrires frm each region d)inj ...

a space is filled up with a charge with volume density ρ=ρoe-αr3, where ρo n α are positive constants , r is the distance from the center of this system.find the magnitude of the electric field strength vector as a funct ...

1.2 straight long conductors of length l1&l3 and wire radii r1 & r2 are bent to form circular coils of turns n1 & n2 respectively.find the ratio of the magnetic induction at their respective centres. a.r2/r1 b.n1r2/n2r1 c.n2l ...

Figure shows a comfortable electrostatic configuration, consisting of four conductors with charges ±Q situated so that the plusses are near the minuses. *Image* What happens if we join them via conducting wires as shown. Wil ...

an infinitely long cylindrical surface of circular cross section is uniformly charged lenghtwise with the surface density σ=σocosφ where φ is polar angle of the cylindrical coordinate system whose z axis coincides with th ...

*Image* the direction of current induced in the circular loop if an electron moves in the indicated direction is 1. clockwise 2. antticlockwise 3. no current is induced 4. direction of current varies with time ...

1. *Image* A circular coil carries current i in direction shown.ABCDECFA is a fig. of 8 lying on a plane which is inclined @ 45deg. to the plane of circular coil.then modulus of \oint_{abcdecfa}^{}{}B.dl =? a.0 b.2 \mu i c. \ ...

Pls give the solution of this sum. Three particles, each having a charge of 10μC are placed at the vertices of an equilateral triangle of side 10cm.Find the work done by a person in pulling them apart to infinite separation? ...

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A parallel plate condenser of capacity 2 micro F is charged to a pd of 100 V. It is then connected to another uncharged condenser of capacity of 3 micro F. Calc energy b4 & after they are connected. ...

I would like to have everybody's idea about the following problem: suppose we keep two circuits with one loop each(radii x,y) side by side.(resistance r1,r2,, emf e1,e2). not neglecting mutual and self inductance, give a ...

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