What value of resistor gives the circuit in FIGURE a time constant of
Value of resistor with time constant is .
In a circuit, current decays through an inductor, and the time constant is given by
is the circuit's equivalent resistance
All values should be substituted,
The two resistors and They are linked in a series.
Simultaneously, the corresponding resistance is equal to
Let's look at the details of eddy-current braking. A square CALC loop, lengthon each side, is shot with velocity into a uniform magnetic field . The field is perpendicular to the plane of the loop. The loop has mass and resistance,and it enters the field at. Assume that the loop is moving to the right along the-axis and that the field begins at.
a. Find an expression for the loop's velocity as a function of time as it enters the magnetic field. You can ignore gravity, and you can assume that the back edge of the loop has not entered the field.
b. Calculate and draw a graph ofover the intervalfor the case that,,,,and . The back edge of the loop does not reach the field during this time interval.
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