Answer:
0.08 N/C
Explanation:
Electric Field: This is defined as the force per unit charge exerted at a point. The expression for electric field is given as,
E = Kq/r².............................. Equation 1
Where E = Electric Field, q = Charge, k = proportionality constant, r = distance.
making q the subject of the equation,
q = Er²/k............................... Equation 2
Given: E = 2 N/C, r = 4 m,
Substitute into equation 2
q = 2(4)²/k
q = 32/k C.
When r is increased to 20 m,
E = k(32/k)/20²
E = 32/400
E = 0.08 N/C.
Hence the electric Field = 0.08 N/C
Explanation:
The energy stored in coal is directly form the sun which is solar energy. This energy are preserved in carbon atoms and they originate from the life processes of a plant.
- Plants carry out photosynthesis and produce their energy by this process.
- Green plants have special adapted structures by which they trap solar energy from the sun and use it to produce their own food.
- The food is used by plant for nutrition and life activities.
- In essence the solar energy is converted to chemical energy in plants.
- To form coal, when plants are rapidly buried their organic matter is preserved from decay by combination with oxygen.
- More burial preserves the complex molecules that have stored during photosynthesis.
- The carbon eventually aggregates for coal.
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Answer:
a) - 7.40 * 10^6 Nm^2/C^2
b) More lines enter than leave the surface
Explanation:
a)
As per the Gauss Law
ε * Intg E.dS = q
E.dS = flux over the whole hull of the submarine
ε = permittivity of vacuum
flux = Σ (charges)/permittivity of vacuum = ( 6.95 + -9 + 27 + -90.5 )*10^-6/8.85 x 10^-12 =
= -0.00006555
/(8.85 x 10^-12)
= - 7.40 * 10^6 Nm^2/C^2
b)
The net electric flux is negative, more lines enter than leave the surface.
Answer: It is A
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Answer:
3. the mass of the atom is concentrated in a very small area.
Explanation:
As the Rutherford experiment has shown that majority of particles has passed the foil with slightest deviations. It shows that the most of the part of atom is empty which doesn't effect the deviation of alpha particles. Few particles are deflected at significant angels shows that there must be a mass occupying the smaller area of atom which is later on called as nucleus.