A hillside of course my friend
<span>Electric field is proportional to q/d^2, where q is the magnitude of the charge and d is the distance. Since all the given units are identical, we can just compare their relative magnitudes without calculating for the exact values.
A) 3/(0.4)^2 = 18.75
B) 1.5/(0.2)^2 = 37.5
C) 6/(0.4)^2 = 37.5
D) 3/(0.2)^2 = 75
Therefore, choice D has the largest electric field of all.
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The image is always virtual and erect. The image is highly diminished or point sized. It is always formed between F and P.
Answer: (a) Smaller charge is
and larger charge is
.
(b) Smaller charge is
and larger charge is
.
Explanation:
(a) When both the spheres have same charge then force is repulsive in nature as like charges tend to repel each other.
Therefore, total charge on the two non-conducting spheres will be calculated as follows.

= 
Therefore, force between the two spheres will be calculated as follows.
F = 
12 N = 

or, 



This means that smaller charge is
and larger charge is
.
(b) When force is attractive in nature then it means both the charges are of opposite sign.
Hence, total charge on the non-conducting sphere is as follows.


Now, force between the two spheres is calculated as follows.
F = 
12 N = 



Hence, smaller charge is
and larger charge is
.
We need to find the time it takes an electron to move in the given circuit.
The time taken for electrons to reach the starting motor from the battery is 60.65 minutes.
I = Current = 134 A
= Avogadro's number = 
A = Area = 
L = Length = 92.2 cm
= Density of copper = 
M = Molar mass of copper = 63.5 g/mol
= Number of valence electrons of copper = 1
e = Charge of electron = 
Number of charge carriers per unit volume is given by

Time taken is given by

The time taken for electrons to reach the starting motor from the battery is 60.65 minutes.
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