Question

how will the pendulum be affected if it is taken to poles ?

Answer 1

In poles the gravitational force is more. So according to the equation , the time period of pendulum increases

Answer 2

$time \: period \: t = 2\pi \times \sqrt{(l \div g)}$
as g decreases at poles time period increases
(I gave time period of simple pendulum
l-length of pendulum
g-acceleration due to gravity )