Which description correctly summarizes how an electric motor causes an axle to turn
2 answers:
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Answer:
Explanation:
The centripetal acceleration of a point moving by circular motion is given by:
where
is the angular velocity
r is the distance from the axis of rotation
The point on the wheel makes 5.0 revolutions per second, so the frequency is
and the angular velocity is
While the distance of the point from the axis of rotation is
Substituting, we find the acceleration:
Answer:
The induced emf can be found by Faraday’s Law.
The magnetic field is increasing at a rate of 0.1T/s. So,
Finally,
Explanation:
Faraday’s Law states that a change in the magnetic flux induces an emf in the circuit. The magnetic flux is the multiplication of magnetic field and the area of the loop. The area of the loop is simple, and the change of magnetic field as a function of time is given in the question.
The minus sign in front of the Faraday’s Law means that the induced current always opposes the change of the magnetic flux. Since we do not know the direction of the magnetic field in this question, we cannot find the direction of the induced emf on the loop.