
Concept explainers
(a)
The relative permeability of the iron when the long iron-core solenoid is connected across
(a)

Answer to Problem 32SP
Solution:
Explanation of Solution
Given data:
The voltage across battery is
The current rises to
The current rises to
Formula used:
The expression of current through the coil in case of charging is written as,
Here,
The expression of time constant for the coil is written as,
Here,
The expression of inductance of the inductor is written as,
Here,
The relative permeability of the iron is expressed as,
Here,
Explanation:
Consider the expression of current through the coil when iron core is present.
Here,
Substitute
Simplify the expression.
Take
Solve for
Write the expression of time constant for the iron core solenoid.
Here,
Substitute
Consider the expression of current through the coil when iron core is removed.
Here,
Substitute
Simplify the expression.
Take
Solve for
Write the expression of time constant when the iron core is removed.
Here,
Substitute
Divide equation (1) and (2).
Simplify the expression.
Consider the expression of inductance of the inductor when iron core is present.
Here,
Consider the expression of inductance of the inductor when iron core is not present.
Here,
From equation (3) and (4)
Recall the expression of relative permeability of the iron.
Substitute
Substitute
Conclusion:
Therefore, the relative permeability of the iron is
(b)
The value of
(b)

Answer to Problem 32SP
Solution:
Explanation of Solution
Given data:
The voltage across battery is
From previous part, the value of time constant for air-cored solenoid is
The value of maximum current is
Formula used:
The Ohm’s Law states that the current through the resistor is directly proportional to the applied voltage across its terminal.
Mathematically,
Rearrange for
Here,
The expression of time constant for the coil is written as,
Here,
Explanation:
Recall the expression of Ohm’s law.
Solve for
Substitute
Consider the expression of time constant for the coil.
Solve for
Substitute
Conclusion:
Therefore, the inductance of the air-cored coil is
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Chapter 34 Solutions
Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
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