The core of a long solenoid with 1000 turns/m and a current of 0. 5 A is filled with an unknown material. It is found that the magnetic field along the axis of the solenoid increases by 0.0017.
What is the magnetic susceptibility of the unknown material? A)
1.7 10-5
B)
3.4 10-5
C)
0.0048
D)
-3.4 10-5
E)
0.0021
Question 2
A semicircular wire of radius R connects two straight wire segments. If a current I flows along the wire, the magnitude of the magnetic field at the center of the semicircular wire due to the current in the semicircular wire is
A)
O I/2R.
B)
O I/4R.
C)
O I/8R.
D)
O I/4R.
E)
O I/8R.
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