Giri wants to make an appartus that can clearly show whether a material is a conductor or not. The material to be tested in the form of a strip must be placed firmly in contact with T1 and T2. What would be the BEST object to place connecting D1 and D2 for this appparatus to work

I'm a little confused with the D1 & D2.

But one of the best conductors is gold.

Step-by-step explanation:

arithmetic sequence

step-by-step explanation:

given that a sequence has terms as

19, 15, 11,

this is represented on a graph

the pattern indicates that the sequence is an arithmetic sequence with i term

a=19 and common difference d =-4

any general term

thus the sequence is reduced by 4 for each successive term starting from 1 and nth term is

24-5n.

first negative term would start after 5th term

5th term =24-25< 0

from 5th term onwards the sequence would be negative.