Question

HEYA !!!

➡ Please Solve Question No. 14 and 15.

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18 PΩIΠTS !!!

Answer 1

Final Answer : 14 : 7.55 * 10^(-9)N
15 : a) 1.25 * 10^7
b) 6.37 * 10^5A/m^2

Q : 14An Electron beam after being accelerated from rest through a potential difference of 500V in vacuum is allowed to impinge normally on a fixed surface. If the incident current is 100uA, determine the force exerted on the surface assuming that it brings the electron to rest.

Ans:
Understanding:

1) We are assuming that the given stream of electrons are striking in such a way that the electrons are striking the wall one at a time.
2) Impulse Momentum Theorem
3) We are assuming force exerted on the surface throughout the process.

Steps:
1)See Pic


Q : 15 A copper wire of radius 0.1mm and resistance 1 k ohm i_ connected across a power supply of 20V.
(a) How many electrons are transferred per second between the supply and the wire at the wire at the end?
b) Write down the current density in the wire?

And. 15 Straight Forward Question.

Just see pic