An ideal solenoid of length 10 cm consists of a wire wrapped tightly around a wooden core. The magnetic field strength is 4.0 T inside the solenoid. If the solenoid is stretched to 25 cm by applying a force to it, what does the magnetic field become

The magnetic field will become 1.6 T.

Explanation:

Given;

initial length of the solenoid, L₁ = 10 cm

final length of the solenoid, L₂ = 25 cm

Magnetic field inside a solenoid is given by;

Therefore, the magnetic field will become 1.6 T.

the part of the wave he is travelling on is the crest

massxgravity x heght=weightxheight= pe

4900=490xh

h=10