By what factor is the self-inductance of an air solenoid changed if its length and number of coil turns are both tripled

The new self inductance is 3 times of the initial self inductance.

Explanation:

The self inductance of a solenoid is given by :

Where

N is number of turns per unit length

A is area of cross section

l is length of solenoid

If length and number of coil turns are both tripled,

l' = 3l and N' = 3N

New self inductance is given by :

So, the new self inductance is 3 times of the initial self inductance.

6 cos 34, 6 sin 34 trig

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it