Question

At what positions the tension in the string of a simple pendulum is

Answer 1

So there can be two case

1. The string used has its own mass

2. The string used is mass less

CASE 1 :- Considering that this string has some mass and a bob is attached to it, then the tension will be different at every point of the string and we cannot consider the whole tension to be at a particular point .

the overall tension at arbitrary point will be given as ∑(mass below that particular point)*g

so we can quote

"Tension will be minimum at extreme lower end of the string"

CASE 2 :- Now lets consider that you have a mass-less string ,then for any such case we assume that any force which acts on the string acts at its geometrical center [or midway the length ] , but one thing to be kept in mind is that, here I`m not saying Center Of Mass of the string but THE GEOMETRICAL CENTER

Now if we consider that a mass M [bob] is connected to a mass-less string of length 2m and the whole string is then attached to ceiling , then the tension (T=Mg) will act at the point 1m @ [mean point of the length].

Now in case of simple pendulum we can say that

Tension is maximum @ Mean position

and Minimum @ extreme position

this is the general answer but you should first check for, if  any clue regarding Case 1 is given or not .

~SRJ