A Rod Lies Across Frictionless Rails in a Uniform Magnetic

question 83

Multiple Choice

A rod lies across frictionless rails in a uniform magnetic field B, as shown. The rod moves to the right with speed v. In order for the emf around the circuit to be zero, the magnitude of the magnetic field should:

• A) not change
• B) increase linearly with time
• C) decrease linearly with time
• D) increase quadratically with time
• E) decrease quadratically with time

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Definitions:

Extraembryonic Membrane

Membranes that are not part of the embryo but provide crucial support functions, such as nutrition and waste removal, during development in the womb.

Blastopore

The opening of the central cavity of an embryo in the early stage of development, which can develop into the mouth or anus in different animals.

Blastocoel

The fluid-filled cavity that forms inside the blastula, an early stage in the embryonic development of animals.

Capacitation

A physiological change that sperm undergo to gain the ability to penetrate and fertilize an egg.