Advertisements
Advertisements
प्रश्न
Justify your answers for each case.
State the significance of the negative value of electrostatic potential energy of a system of charges.
Three charges are placed at the corners of an equilateral triangle ABC of side 2.0 m as shown in the figure. Calculate the electric potential energy of the system of three charges.
Advertisements
उत्तर
U = `(KQ_AQ_B)/r + (KQ_BQ_C)/r + (KQ_CQ_A)/r`
U = `K/r[Q_AQ_B + Q_BQ_C + Q_CQ_A]`
U = `K/r xx [4 xx 10^-6 xx -4 xx 10^-6] + [-4 xx 10^-6 xx 2 xx 10^-6] + [2 xx 10^-6 xx 4 xx 10^-6]`
U = `K/r xx 10^-12[-16 - 8 + 8]`
U = `K/r xx 10^-12(-16)`
U = `(-9 xx 10^9 xx 10^-12 xx 16)/2`
U = -72 × 10-3 J
U = -7.2 × 10-2 J
A negative value signifies a stable system.
APPEARS IN
संबंधित प्रश्न
A cube of side b has a charge q at each of its vertices. Determine the potential and electric field due to this charge array at the centre of the cube.
If one of the two electrons of a H2 molecule is removed, we get a hydrogen molecular ion `"H"_2^+`. In the ground state of an `"H"_2^+`, the two protons are separated by roughly 1.5 Å, and the electron is roughly 1 Å from each proton. Determine the potential energy of the system. Specify your choice of zero potential energy.
Find out the amount of the work done to separate the charges at infinite distance.
A point charge Q is placed at point 'O' as shown in the figure. Is the potential at point A, i.e. VA, greater, smaller or equal to potential, VB, at point B, when Q is (i) positive, and (ii) negative charge?
A point charge Q is placed at point O as shown in the figure. The potential difference VA – VB positive. Is the charge Q negative or positive?
If a charge q0 is there in an electric field caused by several point charges qi. The potential energy of q0 is given by ________.
1 volt is equivalent to ______.
Consider a uniform electric field in the z-direction. The potential is a constant ______.
- Assertion (A): Work done in moving a charge around a closed path, in an electric field is always zero.
- Reason (R): Electrostatic force is a conservative force.
Charges (+q) and (–q) are placed at points A and B respectively which are a distance 2L apart. C is the midpoint between A and B. What is the work done in moving a charge +Q along the semicircle CRD?
