A String with a Fixed Frequency Vibrator at One End

question 21

Multiple Choice

A string with a fixed frequency vibrator at one end is subjected to varying tensions. When the tension is 20 N, a resonance with 3 antinodes results. What tension would cause a resonance with 2 antinodes in this string?

• A) 30 N
• B) 45 N
• C) 80 N
• D) 8.9 N
• E) 13 N

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Definitions:

North Magnetic Pole

The point on the Earth's surface where geomagnetic field lines are directed vertically downwards, the opposite of the Geographical North Pole.

Compass Needle

A magnetized pointer free to align itself with Earth's magnetic field, used in compasses for navigation.

Earth

The third planet from the Sun, our home planet, or in electrical terms, the reference point in an electrical circuit for the return path of currents or a direct physical connection to the ground.

Ampere-Turns

A basic unit for measurement of magnetism. The product of number of turns of wire times current flow.