A Planar Cross Section Through Two Spherical Waves Emanating from the Sources

question 17

Multiple Choice

A planar cross section through two spherical waves emanating from the sources S₁ and S₂ in the plane is shown in the figure. S₁ and S₂ are in phase. The black circles are one and two wavelengths from their respective sources. The lighter circles are one half and one and a half wavelengths distant from their respective sources. If the waves shown arriving at P₂ both arrive with amplitude A, the resultant amplitude at point P₂ is

• A) 0.
• B) .
• C) A.
• D) .
• E) 2A.

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Definitions:

Natural Magnets

Materials found in nature that possess magnetic properties capable of attracting iron, such as magnetite or lodestone.

Magnetic Poles

The two ends of a magnet where the magnetic field is strongest, conventionally labeled as the North and South poles.

Natural Magnets

Materials found in nature, such as magnetite, that possess magnetic properties and generate a magnetic field without any external influence.

Iron

A chemical element with symbol Fe, commonly used in its magnetic form in motors, generators, and transformers due to its ferromagnetic properties.