89 - Electricity Questions Answers
TWO EQ. +VE CHARGES R KEPT AT PT A & B D ELECTRIC POTENTIAL AT D PT B/W A & B (EXCLUDING THESE POINTS ) IS STUDIED WHILE ,MOVING FROM A TO B D POTENTIAL DECREASE THEN INCREASE WHY???
at start when the point will be nearer to first charge, potential due to the nearer charge will be very high, at the middle point of the two charges it will be minimum and after that it will increase again due to its approach towards another charge.
There are two fixed spheres of charges Q and 4Q and the distance between their centres is 6R. The Radius of first sphere is R and radius of the secind one is 2R. A charge -q is to be projected from the along the line joining their centres ( it is on the surface of the sphere with radius R), so that it can reach the surface of other solid sphere of charge 4Q. What will be the minimum velocity to be given so that it reaches there?
sir i have used energy conservation in this problem :
-kqQ/R - kQ4q/5R +.5 mv^2 = -kQq/4r - kqQ4/2R
but im not getting the answer .....is anything left in ths ..please telll
first find a point midway between the two spheres where net E will be 0
Then consider v = 0 at that point and compare the potential energy + kinetic energy of the starting point and that obtained point.
Define Potential Energy?
Potential energy is the energy of a particle due to its position relative to the reference point taken.
Q Q1=1.5C , R1=2M, Q2 =3C&R2=1M WHEN THESE SPHERICAL CAPACITER TOUCHED EACH OTHER THEN CHARGE WILL MOVE OR NOT . IF MOVE THEN HOW MUCH
(MANIPAL 2012)
on touching, the new ratio of charges = x/y = 2/1 this is by the formula q1/q2 = C1/C2 = R1/R2
and x+y = 1.5+3 = 4.5
or 2y+y = 4.5
or y = 1.5
so 1.5 C will move from second to first.
why is electric field of earth is in order of 100v/m any reason by formulae
emf generated between the extremes of equator line = vBl = RωBl
so E = RωBl/l = RωB = 2πRB/T
now calculate
why the direction of electric dipole moment is from -ve to +ve
It is the direction of electric field due to a dipole at axial point.
we taken a equal length of wire like copper and maganim which one is more thicker ?
length are equal and metals are different
but none of the two is a deciding factor for the thickness of wire, so question is irrelevent
why current is not flow in insultor give me proper reasion and its funtions ?
This can be explain by using band theory.
According to this theory movable electrons are present in valence band but for conduction their transfer to conduction band (far from the nucleus in comparison to valence band) is compulsory. In insulators the gap between valence and conduction band is large thats why tranfer is not possible so no conduction
what is the main use of capacitors
Capacitor :- A capacitor is a device to store energy