Question 1 :
Electric charges {tex} + q _ { 1 } , - q _ { 1 } , + q _ { 2 } {/tex} and {tex} - q _ { 2 } {/tex} are placed in free space and {tex} S {/tex} is a spherical Gaussian surface. The electric flux passing over the surface {tex} S {/tex} is :<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/ISC%20-%20Class%2012/5f7c7dbc46f7292c04edf376"><br>

Question 2 :
An ionized helium particle {tex} ( + 2 e ) {/tex} is situated at the origin (0, 0). How much work is done in taking an electron from {tex} x = 3 \mathrm { cm } {/tex} to {tex} x = 6 \mathrm { cm } {/tex} ?

Question 3 :
A body has a positive charge of {tex} 8 \times 10 ^ { - 19 } \mathrm { C } {/tex}. It has:

Question 4 :
What is the locus of an electron projected perpendicular to a uniform electric field?

Question 5 :
Electric field intensity, 'E' at a point P (Figure) at a perpendicular distance 'r' from an infinitely long line X'X having linear charge density {tex}\lambda{/tex} is given by:<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/ISC%20-%20Class%2012/5f7c7dbc46f7292c04edf375"><br>