A Conducting Bar Is Free to Slide Horizontally on the Rails

question 20

Multiple Choice

A conducting bar is free to slide horizontally on the rails of a conducting frame,as shown in the figure.A lightbulb is attached to the right end of the rails.A spatially uniform magnetic field is oriented vertically (perpendicular to the horizontal plane of the rails and bar) .Initially the bar is stationary.The strength of the magnetic field begins increasing in time at a constant rate,which induces a current through the bar,frame,and lightbulb.The bar begins to move due to the magnetic force exerted on it.Once the bar begins to move,the brightness of the lightbulb

• A)stays the same.
• B)increases.
• C)decreases.
• D)suddenly drops to zero.

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Definitions:

Stroke Volume

The amount of blood pumped by the left ventricle of the heart in one contraction, indicating cardiac efficiency.

Cardiac Output

The quantity of blood circulated by the heart through the vascular system every sixty seconds.

Blood Pressure

The pressure of circulating blood on the walls of blood vessels, often measured as systolic over diastolic and a vital sign of cardiovascular health.

Stethoscope

A medical instrument used to listen to the sounds generated inside the body, especially those from the heart and lungs.