Answer:
![E = 6.77 *10^{3} N/C](https://tex.z-dn.net/?f=E%20%3D%206.77%20%2A10%5E%7B3%7D%20N%2FC)
Explanation:
THE GIVEN sheet can be taken as two horizontal force with surface charge density is
at one surface is ∈_1 = ![95*10^ {-9} C/mm2](https://tex.z-dn.net/?f=95%2A10%5E%20%7B-9%7D%20C%2Fmm2)
at oher surface is ∈_2= ![-25*10^{-9} C/mm2](https://tex.z-dn.net/?f=-25%2A10%5E%7B-9%7D%20C%2Fmm2)
the magnitude of electric field due to surface charge is given as![\frac{∈}{2∈_O}](https://tex.z-dn.net/?f=%5Cfrac%7B%E2%88%88%7D%7B2%E2%88%88_O%7D)
So, electric field at P (2 CM below from surface is) = E_1 +E_2
![E = \frac{∈_1}{2∈_O} +\frac{∈_2}{2∈_O}](https://tex.z-dn.net/?f=E%20%3D%20%5Cfrac%7B%E2%88%88_1%7D%7B2%E2%88%88_O%7D%20%2B%5Cfrac%7B%E2%88%88_2%7D%7B2%E2%88%88_O%7D)
![E = \frac{95*10^{-9} +25*10^{-9}}{2*8.85*10^{-12}}](https://tex.z-dn.net/?f=E%20%3D%20%5Cfrac%7B95%2A10%5E%7B-9%7D%20%2B25%2A10%5E%7B-9%7D%7D%7B2%2A8.85%2A10%5E%7B-12%7D%7D)
![E = 6.77 *10^{3} N/C](https://tex.z-dn.net/?f=E%20%3D%206.77%20%2A10%5E%7B3%7D%20N%2FC)
(a) If the balloon is suspended in air and it drifts neither up nor down, it means the forces acting on it are equally balanced. There are only two forces acting on the balloon:
- its weight, of magnitude 1 N, directed downward
- the buoyant force, directed upward
The two forces are balanced, so the buoyant force in this case is equal to the weight of the balloon: 1 N.
(b) when the buoyant force decreases, the weight becomes greater than the buoyant force. This means there is now a net force on the balloon, acting downward, so the balloon starts to drift toward the ground.
(c) when the buoyant force increases, it becomes greater than the weight. This means there is now a net force on the balloon, acting upward, so the balloon starts to go up.
Chemical weathering weakens the outer surfaces of rocks and its primary agent is water. Mechanical weathering is carried out by impact or attrition by water and air.
Both of these forms of weathering combine and cause rocks to obtain a spherical shape.The concentric layers of rock are combined to form structures known as saprolite.
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Option c) 1.5 V
Explanation:
<em>As the circuit is build in series first we will find the current passing through the complete circuit. Current stays the same in each element is the series cirucuit, however, the voltage is different.</em>
Voltage is given by the following formula:
V = IR
<em>Because we have to find current through whole circuit, we will first find resistance of the whole circuit.</em>
Equivalent Resistance R(eq): R1 + R2 = 60 + 60 = 120 ohm
Current passing through whole circuit be:
= 0.025
Now we will find out the voltage between C and D:
Current stays the same in series circuit: I = 0.025 c
Resistance between C and D is, R = 60 ohm
Voltage becomes, V = IR = 0.025 * 60 = 1.5 V