Recently Active Electricity And Magnetism Questions

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an aluminium wire and tungsten wire are of same length and diameter at 0 C . at what temp .does aluminium wire have a same resistance as tungsten at 20 C . given ρw = (5.6 ). 10 -8 Ω m ρal = (2 . 8 )10 -8 Ω m αw = 4.5 .1 ...

if sound level at a place is increase by 30Db pressure bcums 4x times . find x ...

electric potential due to a dipole is cylindrical symmetric.Why? ...

Q1. A/R Stmnt 1: If two long parallel wires, hanging freely are connected to a battery in series, they come closer to each other Stmnt 2: Force of attraction acts between the two wires carrying current ...

1...force on a current carrying current conductor is given by F=(i∫dl )X B WHERE FOR A CONDUCTOR ∫dl REPRESENTS VECTOR SUM OF ALL LENGTH ELEMENTS FROM INITIAL [POINT TO FINAL POINT ...

In the potentiometer circuit shown the balance point (null point) is at "X" . State with reason where balance point will be shifted when a) resistance "R" is increased,keeping all other parameters constant b) resistance "S" i ...

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suppose that the electric field part of an electromagnetic wave in vacuum is: E vector={(3.1 N/C)cos[(1.8 rad/m)y+(5.4*106rad/s)t]}i a)what's the direction of propagation b)find wavelength and frequency of wave c)what's the a ...

*Image* 1. Key K is connected in turn to each of the contacts over short identical time intervals so that change in charge on capacitor is small. Final charge on cap is: 1)2.5 C 2)5 C 3)0.5 C 2. There is a dielectric rod b/w ...

*Image* correct ans are a,c,d. If i ignore the plate Y , the i m getting the answers. I want to know what is the effect of Y. ...

MATCH THE COLUMN : LIST A LIST B 1) A charged particale goes undeviated A) E= 0, B= 0 in electric and magnetic field if 2) A charged particle moves in a circle B) B= 0, E≠0 in the presence of E and B if 3) A charged particl ...

Two identical thin rings each of radius R are co axially placed a R distance apart . If Q1 & Q2 are respectively the uniformly spread on the two rings , the work done in moving a charge "q" from the center of one ring to the ...

*Image* if charge is distributed uniformly in the x-y plane with charge density +(sigma) in 1st quad and -(sigma) in remainig quad then work done in miving a point charge q from (0,0,d) to (0,0,2d) is A) -(sigma)qd/4e B) (sig ...

TWO CONDUCTING SPHERE OF RADII a AND bHAVE CHARGES Q1 AND Q2.DISTANCE BETWEEN THE SPHERE IS R IF E1 AND E2 ARE ELECTRIC FIELD VECTORS AT ANY POINT THEN WHAT IS THE VALUE OF (EPSALION)0∫E1.E2 dv 1-K Q1 Q2/R 2-KQ1.Q1/a+kQ1.Q2 ...

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*Image* correct ans are a,c,d...... Plz giv the explanation for option c. ...

*Image* correct ans are a,c Plz explain ...

Two charges +q1 and -q2 are placed at A and B respectively. A line of force emanates from +q1 at an angle \alpha with AB. At what angle \beta will it terminate at -q2 ? *Image* A) sin^{-1}[\sqrt{\frac{q_{1}}{q_{2}}}sin\frac{\ ...

a current carrying wire is curved.hence electrons flowing wold recieve an acceleration.as the electrons are acecelarating would not they radiate energy. ...

what is vacua junction? ...

In a closed circuit, the current I ( in amp.) at an instant of time t( in secs) is given by I = 4 - 0.08t. The no. of electrons flowing in 50 s trough the cross section of the conductor is A) 1.25 x 1019 B) 6.25 x 1020 C) 5.2 ...

Over a certain region of space , the electric potential is V= 5x-3x^2y+2yz^2 the amgnitude of electric field at origin is (in N/C) a) 3 b) 5 c) 2 d) 18 ...

Can we get a electrric shock from household utensils and water tap? from some days whenever i get up from mah sleep ...n touch the water sink tap....i get a shock....then wenever i touch the window grill...then also the same ...

Capacitance of an isolated spehere is increased n times when it is closed by an earthed concentric sphere. Then the ratio of their radii becomes??? ...

1) (Multiple Answers Correct) An elliptical cavity is carved within a perfect conductor. A +ve charge "q" is placed at the centre of the cavity. Then- *Image* A) Elec. field near A = Elec. field near B (in the cavity). B) Cha ...

*Image* Becoz the words are a bit unclear.."Metallic square of edge l in a vertical plane. Uniform Magnetic field perpendicular to plane of figure. The sqaure is being deformed into a rhombus due to force exerted on it by the ...

Is there any method to find time constant of L-C OR R-C etc circuits?????????????????? ...

THIS QUESTION WAS SOLVED BY MY SIR LAST YEAR ,BUT STILL I AM NOT SATISFIED WITH THE SOLUTION I HOPE I WILL GET SOME AWESOME ANSWERS IN THIS FORUM *Image* a particle of mass m , charge q is released from -∞ along +ve x axis ...