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Concept explainers
(a)
Number of turns on the solenoid.
(a)
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Answer to Problem 42P
Number of turns on the solenoid is
Explanation of Solution
Write an expression for the number of turns on the solenoid.
Here,
Conclusion:
Substitute
Thus, the number of turns on the solenoid is
(b)
The energy stored in the magnetic field during normal operation.
(b)
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Answer to Problem 42P
The energy stored in the magnetic field during normal operation is
Explanation of Solution
Write an expression for energy stored in the magnetic field during normal operation.
Here,
Conclusion:
Substitute
Thus, the energy stored in the magnetic field during normal operation is
(c)
The energy stored.
(c)
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Answer to Problem 42P
The energy stored is
Explanation of Solution
The energy stored is proportional to the square of the magnitude of magnetic field. The magnitude of magnetic field is proportional to the current. Thus, the energy stored is proportional to the square of the current.
Write an expression for the energy stored.
Here,
Conclusion:
Substitute
Thus, the energy stored is
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Chapter 20 Solutions
Physics
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