Question

how will you increase the M.F strength due to solenoid?

Answer 1

1) by increasing no. of turns strength of MF could be increased (coz N is directly proportional to B)

2) by increasing current strength of MF could be increased (coz I is directly proportional to B)

3) by decreasing radius, strength could be increased (coz R is inversely proportional to B)

Answer 2

So as
F is directly proportional to BIL
Thus by :
- increasing magnetic field
- increasing current
- increasing length of conductor
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