Recently Active Electricity And Magnetism Questions

*Image* calculate d current thru d diode .... source voltage is 9V and source resitance is 1kohms ...

*Image* P and Q are two coaxial conducting loops separated by some distance. Wen te switch S is closed, a clockwise curent i1 flows in P and an indused current I1 flows in Q. The switch remains closed for a long time. Wen S i ...

Ohm's law states that the current in a wire is directly proportional to the potential difference across it's ends, right? So why do we write V prop'l to I when the law states I prop'l to V ? ...

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*Image* in the shown figure a) if both ammeter &voltmeter are ideal,then reading of A is 0 & V is 10V b) if both A & V r ideal,reading of A=10A & v=0 c) if A is non ideal & V is ideal,then reading of A is less than 10 ...

*Image* find 1. potential diff btw D & E 2. current through branch BG 3. current through battery btw A & B. try to do wthout using Kirchoff's law ...

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 ...

pb no1: A four kg block carrying a charge of 50microC. is connected to aspring for which k=100N/m. the block lies on a frictionless horizontal track and the system is in a uniform electric field E=5*105V/m. if the blo ...

The neutron which has no charge has a magnetic dipole moment.Is this possible? ...

CAN the trajectory of a charged particle in a electrostatic field coincide with a force line?f yes give some example ...

*Image* Find the current through 1 ohm resistor : ...

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

*Image* 4 concentric hollw spheres of radii R(1),2R(2),3R(3),4R(4) has given the charges as shown then 1&3,2&4 were connected 1. find charge on the inner surface of 3rd conductor 2. charge on the forth conductor 3. the potent ...

This question has been taken from IE IRODOV. pls help me solve this A flywheel with initial angular velocity ω0 decelerates due to the forces whose moment relative to the axis is proportional to the square root of its angula ...

A metal disc of radius a=25 cm rotates with a constant angular velocity ω = 130 rad/s about its axis. Find the potential difference between the centre and the rim of the disc if a) The external magnetic field is abse ...

A copper wire with cross-sectional area S=2.5mm2 bent to make three sides of a square can turn about a horizontal axis OO' (fig. 3.69). The wire is located in uniform vertical magnetic field. Find the magnetic inducti ...

a curious phenomenon was observed by an experimenterworking with a very sensitive galvanometer while sitting ona chair at a table.[the galvanameter was secured on awalland the ends of its winding connected to an open key on t ...

what is delta star method of calculating equivalent resistance...? ...

*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 ???? ...

For any work to be done there must be energy to sustain it. WHERE DOES THE EARTH GET ENERGY TO ROTATE???? Is it due to the gravitaional force??? ...

a metal spherevplaced in a uniform electric field E alon x-axis, then ∂V/∂x a) is uniform both inside and outside the sphere b) is uniform outside but non-uniform inside the sphere c) is uniform inside but non-uniform out ...

the potential decreases uniformly from V1 to V2 along x - axis in a coordinate system as one moves from ( - a,0) to (+a,0). The field at origin is (a) must be (V1 - V2)/2a (b) cannot be less than (V1-V2)/2a (c)must be smaller ...

a lightning arrester is connected to the earth by a circular copper pipe.after lightning strikes,it is discovered that the pipe became a circular rod.explain this phenomenon. ...

three plates A,B,C have charges Q1 Q2 and Q3 now there is said to be redistribution of charges...what will happen to the charges on each surface? ...

*Image* find flux through hemispherical surface in each case ...

The conducting, concentric , hollow spheres A and B have radii a and b respectively, with A inside B. Their common potential is V. A is now given some charge such that its potential becomes zero. The potential of B now will b ...

two current carrying wires may attract each other.in absebce of other forces,the wires will move towards each otherincreasing the kinetic energy.does it contradict the face that magnetic force cannot do any work and hence can ...

*Image* here a charge 2q is given to the shell c and shell a has got q charge inside it....and it is earthed...calculate the charges on the surface of each shell...also pl hilite the concept bhind it ...

consider a region of uniform electric field let a charge paricle is moved by some external force such that work done by electric force is zero, then is it necessary that work done by external force will also be zero as W ext. ...

While a capacitor is charging ,is there a decrease in displacement current value in connecting wires? ...