Problem 20: An inductor
with L = 7.5 H is in a closed circuit
with I = 0.85 A (see the diagram).
When the switch is opened, the current goes to zero in
Δt = 0.19 s.
Part (a) Express the magnitude of
the average induced emf on the
inductor, εave, in terms
of L, I and
Δt.
Part (b) Calculate the numerical value
of εave in volts.
Problem 21: Suppose
a 42.5 cm long, 12 cm diameter solenoid has
1000 loops.
Part (a) Calculate the
self-inductance of it in mH.
Part (b) How much energy is stored
in this inductor when 18 A of current flows through it?
Give your answer in J.
Part (c) How fast can it be turned
off (in s) if the average induced emf cannot
exceed 2.9 V?
Problem 20 An Inductor With L 7 5 H Is In A Closed Circuit With I 0 85 A See The Diagram When The Switch Is Op 1 (28.99 KiB) Viewed 55 times
(4%) Problem 24: A 1.4 H inductor in an RL circuit (with resistance 1.852) is initially carrying a current of 5.25 A. A switch is then thrown (between positions 1 and 2, see figure), which causes the inductor to begin losing energy. Randomized Variables R 1 = 5.25 A L = 1.4 H R=1.850 How long will it take the current to decline to 25.00% of its initial value? Express this value in seconds. 1 =
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