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

problem 1:

Conductors: conductors allows the flow of electrons to pass through it.

insulators : insulators opposes the flow of electrons to pass through it.

Charging by method of induction:The process relies on the fact that a charged object can force or induce the movement of electrons about the material being charged.The presence of a charged object near a neutral conductor will force (or induce) electrons within the conductor to move. The movement of electrons leaves an imbalance of charge on opposite sides of the neutral conductor.

Conservation of charge : the total electric charge of an isolated system remains constant irrespective of whatever internal changes may take place.

charge of 1 electron = -1.6 10^-19 c

charge of 1000 electrons = -1. 6 x 10^-19 x 1000 = -1.6 x 10^-16 C

problem 5:

1.(a) 2.(b) 3(c) 4(c) 5.(b) 6.(a) 7.(c) 8.(c) 9.(b) 10.(c) 11(a) 12.(a) 13.(c) 14.(g) 15.(c) 16.(a) 17.(c) 18.(a) 19.(b) 20.(c)

problem 2:

E ={(9 x 10⁹ )x (10 x 10^-12)} / {(0.2 x 10^-6)²} = 2.25 x 10¹² N/c