AP® Physics C: E&M - Magnetic Flux - MCQs
Questions
A loop of wire with resistance \(2\Omega \) lies in a magnetic field. The magnetic flux \(\phi _{m}\) through the loop as a function of time t is given by \(\phi _{m}\)=( \(2t^{2}+2t\)) , where \(\phi _{m}\) is in tesla.meters squared and t is in seconds. What is the current in the loop at t = 3 s ?
(A) 6 A
(B) 7 A
(C) 12 A
(D) 14 A
(E) 24 A
▶️Answer/Explanation
Ans: B
Questions
A square wire loop of side 0.2m moves with a constant speed of u=25 \(\frac{m}{s}\) through a region containing a B=0.15T as shown above left. A graph of the magnetic flux \(\phi \) through the loop as a function of time t is shown above right. Time t=0 occurs when the right edge of the loop just begins to enter the field. What is the total width of the magnetic field through which the loop moves?
(A) 0.1 m
(B) 0.2 m
(C) 0.4 m
(D) 0.6 m
(E) 0.8 m
▶️Answer/Explanation
Ans: C
Questions
A square wire loop of side 0.2m moves with a constant speed of u=25 \(\frac{m}{s}\) through a region containing a B=0.15T as shown above left. A graph of the magnetic flux \(\phi \) through the loop as a function of time t is shown above right. Time t=0 occurs when the right edge of the loop just begins to enter the field. What is the magnitude of the induced emf in the wire loop at t=4ms?
(A) 0 V
(B) 0.50 V
(C) 0.75 V
(D) 3.0 V
(E) 6.0 V
▶️Answer/Explanation
Ans: C