1.

Thestrenght ofmagneticfieldalongthe axisof a solenoidcoil:

Answer»

INCREASE on increasingcurrentflowingthrough thesolenoid coil
increase on INCREASINGTHE number ofturns in the solenoid coil
increaseson introducinga soft iron coreinside thesolenoidcoil .
all to the above

SOLUTION :The strength of magnetic field along the axis of a solenoid coil increases on increasing the current flowing through the solenoid coil and on increasing the number of TURNS in the solenoid coil. Moreover, if a soft iron core is inserted inside the solenoid ROIL then magnetic field increases many fold.


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