Volume 2

A charges Q is placed at each of the two opposite corners of a square. A charge q is placed to each of the other two corners. If the net electrical force on q is zero, then Q/q equals A charges Q is placed at each of the two opposite corners of a square. A [...]

Two points P and Q are maintained at potentials of of 10V and −4V respectively. The work done in moving 100 electrons from P to Q is Two points P and Q are maintained at potentials of of 10V and −4V respectively. The work done in moving 100 electrons from P to Q is December [...]

Let P(r)=Q/πR^4r be the charge density distribution for a solid sphere of radius R and total charge Q. For a point ‘p’ inside the sphere at distance r1 from the centre of the sphere, the magnitude of electric field is: Let P(r)=Q/πR^4r be the charge density distribution for a solid sphere of radius R and [...]

Let there be a spherically symmetric charge distribution with charge density varying as ρ(r)=ρ(5/4−r/R) up to r=R, and ρ(r)=0 for r>R, where r is the distance from the origin. The electric field at a distance r(r less then R) from the origin is given by and ρ(r)=0 for r>R Let there be a spherically symmetric [...]

A thin semi-circular ring of radius r has a positive charge q distributed uniformly over it. The net field E at the centre O is A thin semi - circular ring of radius r has a positive charge q distributed uniformly over it. The net field E at the centre O is December 5, 2020 [...]

Let C be the capacitance of a capacitor discharging through a resistor R. Suppose t is the time taken for the energy stored in the capacitor to be reduced to half its initial value and t2 is the time taken for the charge to reduce to one fourth its initial value Then the ratio t1/t2 [...]

The electrostatic potential inside a charged spherical ball is given by ϕ=ar^2+b where r is the distance from the centre and a, b are constants. Then the charge density inside the ball is: b are constants. Then the charge density inside the ball is: The electrostatic potential inside a charged spherical ball is given by [...]

A resistor ‘R’ and 2(μ)F capacitor in series is connected through a switch to 200 V direct supply. A cross the capacitor is a neon bulb that lights up at 120 V. Calculate the value of R to make the bulb light up 5 s after the switch has been closed. (log10 2.5=0.4) A charge [...]

Two identical charged spheres suspended from a common point by two mass-less strings of length l are initially at a distance d ( d much less then l) apart because of their mutual repulsion . The charge begins to leak from both the spheres at a constant rate. As a result the charge approach each [...]

Two positive charges of magnitude q are placed at the ends of a side ( side 1) of a square of side 2a . Two negative charges of the same magnitude are kept at the other corners . Staring from rest , n a charge Q moves from the middle of side 1 to the [...]