Question

What is the difference in between conductor and insulators? Write with necessany figures and examples of electrostatic charging by Induction? What is conservation of Charge? 1. Problem-1: Find the charge (Q) of a system having 1000 electrons? Explain the electric field produced due to a positive and negative point charges separately with necessary figures? 2. Problem-2: Calculate the electricfield (E) at a field point of 0.2 μm from a point charge q 10 pC? 3. What is electric dipole moment? Calculate torque (t) and potential energy (U) due a dipole system of (+q) and (-q) in an electric field E and separate by a distance "d"? Problem-3: What is the potential energy to be stored in a dipole system of moment 2 mC in an electric field of 10 N/C at an orientation 15°: State Gauss law? Explain how to find electric flux (D) due to a point charge inside spherical and non-spherical surfaces separately with necessary figures? 4. Problem-4: What is the electric flux (D)produced through a disk of radius 100 cm which is oriented at 20° to the uniform electric field (E) of 1.0 x 104 N/Coul 5. Define electric potential (V), potential energy (U), and potential gradientth dV dr necessary formulas and figures? Write each S.I. units? Problem-5: Find the potential difference (AV), when an electron moves over 50 um in between two points in a linear accelerator with a uniform electric field of 1.0 x 108 N/C?

Answer 1

Conductors - Conductors are substances that allow flow of free electrons and electric current.

Ex- most of the metals like copper, aluminium and iron are good conductors.

Insulators - insulators do not allow flow of electric current due to their high resistance.

Ex- plastic , rubber, glass etc.

Examples of electrostatic charging by induction,

When you are approaching a neutral sphere with a negatively charged rod, one side of sphere bocomes positive and another side becomes negative . When you remove the rod, whole surface of sphere becomes charged due to induction.

Conservation of charge - according to law of conservation of charge

Neither be created nor be destroyed. Total charge of an isolated system remains constant.

Charge of system having 1000 electrons,

Q = ne

Q = 1000 * 1.6*10^(-19)

Q = 1.6*10^(-16) C