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Working of a moving coil galvanometer

Problem

As current runs through a galvanometer, the pointer moves \phi, equals, 45, degreefrom initial position to final position as shown below.
Initial position
Final position
The magnetic moment of the wire is m and the magnetic field linked with the wire is B.
What is the angle between m and B in the initial and final position?
  • Initial position:
    • Your answer should be
    • an integer, like 6
    • a simplified proper fraction, like 3, slash, 5
    • a simplified improper fraction, like 7, slash, 4
    • a mixed number, like 1, space, 3, slash, 4
    • an exact decimal, like 0, point, 75
    • a multiple of pi, like 12, space, start text, p, i, end text or 2, slash, 3, space, start text, p, i, end text
    degree
  • Final position:
    • Your answer should be
    • an integer, like 6
    • a simplified proper fraction, like 3, slash, 5
    • a simplified improper fraction, like 7, slash, 4
    • a mixed number, like 1, space, 3, slash, 4
    • an exact decimal, like 0, point, 75
    • a multiple of pi, like 12, space, start text, p, i, end text or 2, slash, 3, space, start text, p, i, end text
    degree
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