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The torsion balance shown in the figure below is used in an experiment to measure radiation pressure. The suspension fiber exerts an elastic restoring torque. Its torque constant is 1 ✕ 10-11 N·m/degree, and the length of the horizontal rod is 5.10 cm. The beam from a 1.90 mW helium-neon laser is incident on the black disk, and the mirror disk is completely shielded. Calculate the angle between the equilibrium positions of the horizontal bar when the beam is switched from "off" to "on."

The torsion balance shown in the figure below is used in an experiment to measure radiation pressure. The suspension fiber exerts an elastic restoring torque. Its torque constant is 1 ✕ 10-11 N·m/degree, and the length of the horizontal rod is 5.10 cm. The beam from a 1.90 mW helium-neon laser is incident on the black disk, and the mirror disk is completely shielded. Calculate the angle between the equilibrium positions of the horizontal bar when the beam is switched from "off" to "on."

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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The torsion balance shown in the figure below is used in an experiment to measure radiation pressure. The suspension fiber exerts an elastic restoring torque. Its torque constant is 1 ✕ 10-11 N·m/degree, and the length of the horizontal rod is 5.10 cm. The beam from a 1.90 mW helium-neon laser is incident on the black disk, and the mirror disk is completely shielded. Calculate the angle between the equilibrium positions of the horizontal bar when the beam is switched from "off" to "on."

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