Arihant Physics by D.C Pandey
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 will be
05
Dec
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:
05
Dec
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)
05
Dec
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 other with a velocity v. Then as a function of distance x between them .
05
Dec
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 centre of square, its kinetic energy at the centre of square is -.
05
Dec
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 [...]
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Arihant Physics by D.C Pandey
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Chapter 2 - Electrostatic Potential and Capacitance
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Volume 2
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its kinetic energy at the centre of square is -. ,
n a charge Q moves from the middle of side 1 to the centre of square ,
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 ,
An electric charge +q moves the velocity V = 3 i ^ + 4j ^+ k ^ , in an electromagnetic field given by: E = 3i ^ + j ^ + 2 k ^ and B = i ^+ j ^ − 3k ^. The y−component of the force experienced by q is :
05
Dec
An electric charge +q moves the velocity V = 3 i ^ + 4j ^+ k ^ , in an electromagnetic field given by: E = 3i ^ + j ^ + 2 k ^ and B = i ^+ j ^ − 3k ^. The y−component of the force experienced by q is : [...]
Combination of two identical capacitors, a resistor R and a dc voltage source of voltage 6V is used in an experiment on a (C−R) circuit. It is found that for a parallel combination of the capacitor the time in which the voltage of the fully charged combination reduces to half its original voltage is 10 second. For series combination the time needed for reducing the voltage of the fully charged series combination by half is-
05
Dec
Combination of two identical capacitors, a resistor R and a dc voltage source of voltage 6V is used in an experiment on a (C−R) circuit. It is found that for a parallel combination of the capacitor the time in which the voltage of the fully charged combination reduces to half its original voltage is 10 [...]
Statement-1: When a charge q is take from the centre of the surface of the sphere its potential energy changes by qρ/3ε0. Statement-2: The electric field at a distance r(r
05
Dec
Statement-1: When a charge q is take from the centre of the surface of the sphere its potential energy changes by qρ/3ε0. Statement-2: The electric field at a distance r(r Statement-1: When a charge q is take from the centre of the surface of the sphere its potential energy changes by qρ/3ε0. Statement-2: The electric [...]
In a uniformly charged sphere of total charge Q and radius R the electric field E is plotted as a function of distance from the centre. The graph which would correspond to the above will be:
05
Dec
In a uniformly charged sphere of total charge Q and radius R the electric field E is plotted as a function of distance from the centre. The graph which would correspond to the above will be: In a uniformly charged sphere of total charge Q and radius R the electric field E is plotted as [...]
Two charges, each equal to q, are kept at x=−a and x=a on the x-axis. A particle of mass m and charge q0=q/2 is placed at the origin. If charge q0 is given a small displacement (y is much less then a) along the y-axis, the net force acting on the particle is proportional to
05
Dec
Two charges, each equal to q, are kept at x=−a and x=a on the x-axis. A particle of mass m and charge q0=q/2 is placed at the origin. If charge q0 is given a small displacement (y is much less then a) along the y-axis, the net force acting on the particle is proportional to [...]