Answer: I am not for sure
Explanation:
Answer: (b)
Explanation:
Given
Original length of the rod is 
Strain experienced is 
Strain is the ratio of the change in length to the original length

Therefore, new length is given by (Considering the load is tensile in nature)

Thus, option (b) is correct.
It can provide measurements of stars with a higher angular resolution than is possible with conventional telescopes.
Answer: A collective noun does name a group of people like a family and also it can also be for objects too.
Collective noun: A noun that is in singular form but that refers to a group of people of things
Explanation:
Answer:
I think
electromagnets require power to operate