List of top Mathematics Questions on Magnetic Field

If \( A \) is the set of odd numbers less than 6 and \( B \) is the set of prime factors of 30, then:
If \( A = \{1, 2, 3, 4, 5\} \) and \( B = \{1, 3, 5, 7\} \), then \( n(A \cap B) = \dots \):
A conducting loop in the plane of the paper is halfway into the magnetic field (which points into the page). If the magnetic field begins to increase rapidly in strength, what happens to the loop?