The answer is Anorthosite. This is a kind of intrusive igneous rock composed mainly of calcium-rich plagioclase feldspar. All anorthosites located on Earth contain of rough crystals, but some illustrations of the rock reserved from the Moon are outstandingly crystalline.
Solution :
Let us consider the Gaussian surface that is in the form of a cylinder having a radius of r and a length of A which is
.
The charged enclosed by the cylinder is given by,
(here, V =
is the volume of the cylinder)
If
is positive, then the electric field lines moves in the radial outward direction and is normal to Gaussian surface which is distributed uniformly.
Therefore, total flux through Gaussian cylinder is :


Now using Gauss' law, we get

or 
Therefore, the electric field is 
Hence, option (d) is correct.
Answer:
The switch within the closed circuit is opened and it stops the flow of current in a circuit.
Explanation:
- Current is defined as a flow of electrons in a system or a circuit.
- There are two basic things needed for current to flow in a system
- One is the electro-motive force and the other is the complete path for current to flow.
- If a switch in a closed circuit gets opened, it restricts the path of current flow.
- Thus it stops the current to be flowed through the circuit.
Answer:
Explanation:
A and B are touched .
charge on each of them after touching = (9q - q) / 2 = 4q
when C is touched with A
charge on A and C each after touching
= 4q + 0 / 2 = 2q
When C is touched with B
charge on each of them
(2q + 4q ) / 2 = 3 q
Final charge on C = 3q