Question

How does the magnetic field set up by a solenoid change when:
a) the number of turns of the coil are increased?]
b) the strength of current is increased?
c) soft iron core is instead with in the cell?

Answer 1

When a current passes through it, it creates a nearly uniform magnetic field inside. Solenoids can convert electric current to mechanical action, and so are very commonly used as switches. The magnetic field within a solenoid depends upon the current and density of turns.