P. 4162. A magnetized needle can swing horizontally inside a solenoid whose symmetry axis is horizontal. The length of the solenoid is 25 cm, and the number of its turns is 100. When there is no current in the solenoid the needle makes 10 total swings in each minute due to the magnetic field of the Earth. Now the solenoid is placed such, that its symmetry axis is perpendicular to the magnetic meridian. The needle makes 51 swings in each minute when the current in the solenoid is 1 A.
a) What is the horizontal component of the magnetic field of the Earth at the location of the experiment?
b) How many swings does the needle make if the direction of the current in the solenoid is changed? (Its magnitude remains the same.)
Deadline expired on 11 May 2009.