Popular Electricity And Magnetism Questions

Q1. The electric field and electric potential at a point are E and V respectively. (a) If E=0, V must be 0 (b) If V=0, E must be 0 (c) If E≠0, V cannot be zero (d) If V≠0, E cannot be zero. Q2. The electric potential decr ...

Q1. HCV example 18.... given: dipole moment = 3.4*10-30C-m... separation = 10-10m .. find mag. of charge.. simple q = D/d = 3.4*10-20C doubt is how can q have charge less than proton ? Q2. A positive charge q is placed in fro ...

WHY THE MAGNETIC FIELD LINES IN A TOROID R CONFINED TO WITHIN IT's CORE...BUT NOT SO IN CASE OF SOLENOID.... ...

A pt charge q is placed inside a conducting spherical shell of inner radius 2R and outer radius 3R at a distance R from the centre of the shell.Find the potential at the centre ...

*Image* If each Roa =Rob=Roc=Rod=Rab=Rbc=Rcd=Rda=R Resistance between o and a is ...

*Image* the cells given in the circuit are 5v each and have internal resistance of 0.2 ohms, then the reading in the ideal volt meter is?? ...

Four equal charges q0 are kept fixed on the vertices of a square of side 'a'. A charge q is kept at the center of the square. Then : a) charge q is in stable equilibrium b) charge q is not in stable equilibrium c) cha ...

*Image* In the figure there is a four way key at the middle . if key is thrown from situation BD ton AD , then how much charge will flow through point O ???? ...

*Image* In the adjoining figure, If the INPUT is a Square Wave, the Output wave will look like : ...

If a charge q is placed at the centre of line joining two equal like charges Q,the system will be in equilibrium if q is a) -Q/2 b) -Q/4 c) +Q/2 d) +4Q Plz explain yur ans ...... ...

If a proton moves with a velocity 'v' parallel to a current carrying wire,a magnetic FORCE acts on it.If the same particle is seen from a frame moving with an identical velocity in the same direction then.... 1)Will the magne ...

*Image* second one please explain clearly.. first one please confirm answer.. ...

I never quite understood the concept of electrostatic shielding. In an effort to understand, posted three questions. Pls help in those. Post any thing valid u have in this concept *Image* there is a charge 'q' at P. O is cent ...

1..electric lines of force can never be closed curves 2..electric line of force are path followed by a unit positive charge in an elecric field ...

Q(1) An inductor is connected to a battery through a switch. Explain why the emf induced in the inductor is much larger when the switch is opened as compared to the emf induced when switch is closed .( not a doubt) Q(2) A met ...

Ques1) *Image* An infinite wire having charge denisty λ passes through one edge of the cube having edge length ' l ' .The wire is just inside the cube. Find the (a)Total flux passin through the cube. (b) Flux passing through ...

*Image* A finite ladder is constructed by connectiong several sections of 2uF and 4uF capacitors combination as shown. IT is terminated y a Capacitor of C...wht should be the value oif C...so that the equivalent capacitence o ...

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 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 ...

*Image* all the plates hv been given the indicated charges.find the charge n left side of plate with charge q a)-8q b)9q c)0 d)none andplease not just options give a propr solution ...

Point charges q and -q are kept at the alternate corners of a cube of side a. Write the expression for the work done in removing all the charges far away from each other *Image* ...

f f for a spherical shell a)if potential inside it is zero then it necessarily electrically neutral b)electric field in a charged conducting spherical shell can be zero only when the charge is uniformly disturbed c)electric p ...

STATEMENT 1: During the charging of a capacitor(with the help of a battery), the battery is only energising the circuit and not supplying any charge to the circuit. STATEMENT 2: When capacitor is charged with the help of a ba ...

Do protons hav magnetic moment?? ...

*Image* find equivalent resistance across AB (the two points at the base of the outermost equilatral trianngle..) hint: use principle of symmetry. ...

Q1 A solid spherical region having a spherical cavity whose diameter R is equal to the radius of spherical region ,has total charge Q.Find electric field at point at distance x from the centre of spherical region and lying on ...

*Image* magnitude of induced E at P is proportional to ?? 1)1/r 2) r 3)1/r^2 4)zero. ...

*Image* The Magnetic feild is B(j)... What is the velocity with which the cylinder reaches the ground?? ...

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1. A wire of resistance ' R ' and length ' L ' is connected to a d.c. source of emf V through a switch ' S ' . *Image* At t = 0, the switch ' S ' is closed and at the same time an external agent starts stretching the wire suc ...