Question

The given diagram shows a circuit containing a coil wound on a long and thin
cardboard tube.

i) Draw the magnetic lines of force inside the coil and also their directions.
ii) Mention two methods to increase the strength of a magnetic field inside a
coil.
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Answer 1

Answer:

The strength of the magnetic field around a solenoid can be increased by: increasing the number of turns on the coil. increasing the current. placing an iron core inside the solenoid.