A loop of wire of radius $$\(r\)$$ and resistance $$\(R\)$$ is exposed to a magnetic field pointing into the page that steadily increases from zero to magnitude $$\(B\)$$ in time $$\(t\)$$, as shown. Describe the induced current.
A.
\(\pi r B / t\), clockwise
B.
\(\pi r B / t\), counterclockwise
C.
\(\pi r^{2} B / R t\), clockwise
D.
\(\pi r^{2} B / R t\), counterclockwise
E.
\(\pi r^{2} B / t\), counterclockwise
Exam No：AP Physics C(EM) Practice Test Year：2024 Question No：APPhysicsCEM2024AP0081
Answer:
D
Knowledge points:
5.1 Electromagnetism: Electromagnetic Induction (Including Faraday’s Law and Lenz’s Law)
Solution:
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