Recently Active Electricity And Magnetism Questions

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Three solenoid coils of same dimension , same number of turns and same number of layers of winding are taken. Coil 1 with inductance L1 was wound using a Mn wire of resistance 10Ω/m. Coil 2 with inductance L2 was wound using ...

1.The Fundamental radio antena is a metal rod which has a lenght equal to___________in free space at the frequency of operation. λ, λ/2, λ/4 ,3λ/4. 2.Vidicon works on the principle of: electrical-conductivity,photo-conduc ...

there is an infinite long cylindrical cavity in an infinite conductor. a positive point charge is kept (fixed) on the axis of the cylinder. stat1 : in electrostatic condn, electric field at any point near the the surface of t ...

A large plate with uniform surface charge density σ is moving with constant speed v,in a direction parallel to the plate,what will be magnetic field and its direction? ...

i am not getting the solution. plzz try this. A light conducting string, with one end fixed to the ceiling is wound to the rim of conducting ring of mass `m` and radius r with centre c.A uniform magnetic field B exists normal ...

Calculate current flowing when switch S is closed *Image* All resistances are of 1Ω ...

if u know this it is easy but if u dont know, its worth knowing.... Q) a spherical ball of radius R is uniformly charged with charge density ρ .determine the electrostatic energy of the sphere. ...

i am totally weak in capacitors so just started with that topic. *Image* find the capacitance of the resulting capacitor in the arrangement shown. also please tell me in general how to do such sums when a dielectrics are inse ...

Do protons hav magnetic moment?? ...

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

Q.1 Which of the following statement is true & why? (A) Ex= Ey =Ez (B) Ex>Ey>Ez (C) Ex=Ez<Ey (D) Ex<Ey<Ez *Image* Q2. A parallel plate capacitor is charged to potential V by a source of emf . After removing the ...

21. A parallel plate capacitor with air gap between its plates is charged using a battery and remains connected to the battery. Match the column I with column II. Column I Column II (a) Electric field intensity between the pl ...

*Image* Which set of the quantities is remaining conserved during motion of the particle? (a) Angular velocity, total mechanical energy, magnitude of net force (b) Angular velocity (c) Angular momentum, mechanical energy (d) ...

An inductor coil joined with a 6 V battery draws a steady current of 12 A. This coil is connected to a capacitor and an AC source of RMS voltage 6 V in series. If the current in the circuit is in phase with the emf, the rms c ...

*Image* find equivalent capacitance....All are in μF ...

A conducting rod of length l is hinged at a point.It is free to rotate in a vertical plane.There exists a uniform mag. field B perpendicular to the plane.The rod is released from horizontal position.What is the potential diff ...

If we find the magnetic field at a point due to a straight finite wire carrying current by Ampere's law, we get the same expression as for an infinite wire which is μ0I/2πr which is absurd bcoz for a finite wire it is given ...

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

In a uniform sphere of charge density P (rho), a small cavity is created. The center of the cavity is at a distance a from the center of the sphere. Taking center of the sphere as origin and vector a as unit vector along the ...

On two smooth fixed parallel rod, a rod of mass m and kength l is placed. Ends of fixed rod is connected with battery and resistance and uniform magnetic field is present inside the page switch is closed at t=0. *Image* A. wh ...

A conducting loop carrying a currrent I is placed in a uniform magnetic filed pointing in to the plane of the paper as shown. The loop will have a tendency to expand contract move towards positive x axis move towards negative ...

*Image* a line charge λ per unit length is lodged uniformly onto the rim of a wheel of mass M and radius R. The wheel has light non- conducting spokes and is free to rotate without friction about its axis . a uniform magneti ...

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15 identical capacitances , each of 1μF are connected in a hexagonal network ABCDEF such that each vertex is connected with each of the others directly by 1μF .The capacitors and the wires in the network are insulated from ...

Two coils of wire having identical resistances, R, are connected as shown *Image* the upper end of the first coil is connected to the end of the second and vice-versa. their cross-sectional areas are A1 and A2. the two are ke ...

Draw the graph between reactance and frequency in a series LC circuit ...

Can someone prove that for a hollow sphere given a uniformly distributed charge Q and rotated with ang. vel. ω the magnetic moment of sphere = (Q/3)* r2ω where r is radius ...

A static charge distribution produces a radial electrid field E = ae-br/ r2 where a nad b are constants. total charge responsible for this field is ? A) 0 B) 4Πε0ar C) 4Πε0br D) 4Πε0ae-br I think it should be D . it is ...