Answer:
The potential for r > rb is equal to zero.
Explanation:
For r > rb, the potential is:

Then, the net potential is:



Concave mirror...as it focus the light at a given point..... concave mirror is converging !!!
Answer:
The work done on the gas = 2PV
Explanation:
In this question, we need to apply the basic gas laws to determine the word done.
For this question, we need to draw a PV diagram (a pressure-volume diagram), which I have made and attached in the attachment. So please refer to that attachment. I will be using this diagram to solve for the work done on the gas.
So, Please refer to the attachment number 1. where x -axis is of volume and y-axis is of pressure.
As we know that, the work done on the gas is equal to the area under the curve.
W = Area of the triangle
W = 0.5 x ( base) x ( height)
W = 0.5 x (BC) x (AC)
W = 0.5 x (3V-V) x (3P-P)
W = 2PV
Hence, the work done on the gas = 2PV
Answer:

Explanation:
As we know that rate of change in flux will induce EMF
So here we can

now we have

now we also know that induced EMF is given by



now plug in all values in it


False they simple machines do not reduce the amount of work you do it would just reduce the amount of force you use.