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Concept explainers
a.
Magnitude and direction of force.
a.
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Answer to Problem 73A
Explanation of Solution
Given:
Current through the wire,
Strength of earth’s magnetic field,
Formula Used:
Force on current carrying wire in magnetic field is given as,
Where,
Calculation:
Angle of wire with magnetic field,
On substituting the given values in above relation,
From Flemings Left Hand Rule
As direction of current is towards west (represented by middle finger) and direction of magnetic field is towards south (represented by index finger) so, the direction of force is downward (represented by thumb).
Conclusion:
Therefore, magnitude of force is
b.
To identify: Whether the magnetic force obtained in part (a) is important in designing the tower or not.
b.
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Answer to Problem 73A
No, the magnetic force obtained in part (a) is not important in designing the tower or not.
Explanation of Solution
Given:
Current through the wire,
Strength of earth’s magnetic field,
For a transmission line wire the general weight is around 3 N/m to 5 N/m
The above calculated magnetic force is
Since the magnetic force
So, the magnetic force can be neglected in comparison of weight of wire.
Hence it is not important in designing of towers.
Chapter 24 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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