What happens to the strength of an electromagnet when the number of coils in the solenoid in increased a. it depends on what metal makes up the solenoid
b. it increases
c. it remains the same
d. it deceases

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.