Recently Active Electricity And Magnetism Questions

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In electron's frame of reference, attractive electrostatic force is balanced by centrifugal force [don't chuckle to read that word as many including me often do ;)] and thus doesnot move! (remember we are in electron's refere ...

please solve pg 166 Q12). 2 conducting spheres radii R1 and R2 kept separated if spheres connected by conducting wire, find capacitance Ans = 4*pi*epsilon not*(R1+R2) Why is it parallel Q47.b) capcitor 5 microfarad charged to ...

1) In a series resonant LCR circuit the voltage across R is 100V and R= 1KΩ, C=2μF. The resonant frequency ω is 200 rad s-1. At resonance, the voltage across L is: a)40 b)250V c)4*10-3V d)2.5*10-2V 2)A coil of inductance 3 ...

*Image* Five identical capacitor plates each of area A are arranged such that adjacent plates are at a distance d apart. The plates are conneted to a source of emf V as shown.What is the magnitude and nature of charge on plat ...

A step down transformer reduces 220V to 11V. the primary draws 5amp. of current and the secondary supplies 90amp. The efficiency of transformer is: 1) 20% 2)44% 3) 90% 4)100% ...

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What is the Rule governing the relation of angle between the direction of magnetic field and magnetic moment? ...

A system consists of a cylindrical anode of radius B and a coaxial cylindrical cathode of radius A . A filament located along the axis of the system carries a heating current I . Find the least potential difference between th ...

hey guyes please help me out i have lot of conceptual confusions in electrostatics. 1. A charged rod attracts bits of paper due to polarizationin paer molecules but why they often jump violently away from it when touched by t ...

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

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a really nice ques for practice .......... not a doubt the equivalent capacitance may be equal to 1)0.3μF 2)0.5μF 3)0.9μF 4)2μF 5)3.2μF 6)1μF *Image* cheers!!!!![1][1][1][1] ...

ques-- A nonconducting plate of radius r and mass m which has q charge distributed all over it .The plate is rotated about its axis with an angular speed ω.What is the relation of magnetic moment μ and angular momentum l of ...

Consider three charges q,q and -q is placed at the vertices of an equilateral triangle, as shown in fig what is the force on each charge? \left|F_{1} \right|=\left|F_{2} \right|=F and \left|F_{3} \right|=\sqrt{3}F *Image* ...

An electron falls through a distance of 1.5 cm in a uniform electric field of magnitude 2.0\times 10^{4}NC^{-1} . The direction of the field is reversed keeping its magnitude unchanged and a proton falls through the same dist ...

we know electric field is a conservative field and so, ∫cloosed loopE.dl=0 but suppose a conducting loop is placed in a changing magnetic field, emf is induced and electrons go round a loop and the work done in taking the e ...

this is very easy may be!! Well, we know that permeability of a medium is given by.... μmedia=μr.μo where μr is the relative permeability.. μo is the permeability of free space... so now question is: For a given media is ...

after quite sometime now!!! well in this question i will give a question and 2 solutions to it...the people will have to tell which one is correct and why the other one is wrong!!!! so here goes the question(IRODOV):: A point ...

last one for today! suppose we are charging a capacitor of capacitance C across a potential difference(battery) of V. Energy stored in capacitor = 1/2 CV2 work done by battery=q.V but q=CV so work done = CV2. where did the re ...

hey this is another one from electrostats!! suppose we are to find the electrostatic fiield at a point on the axis of a uniformly charged ring! i am not going to type the whole derivation now i hope all of u know it :D . i am ...

Consider a solid NON-CONDUCTING sphere(of radius R) of mass M bearing charge (+)Q uniformly distributed over its volume... at a distance a(< R) there is a spherical cavity in the sphere of radius r. the line joining the ce ...

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 ...

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hey pls checkout my problems and help me out!!! a request.... ...

pls solve my 6 questions dat i hav posted here....plsssssss ...

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