A Bar Magnet Is Held Vertically with Its Upper End

question 59

Multiple Choice

A bar magnet is held vertically with its upper end a little bit below the center of a horizontal metal ring. The upper end of the magnet is its north pole, as shown in the figure. The bar magnet is now dropped. An observer views the ring from above its center. To this observer, how will the induced current in the ring behave as the magnet falls?

• A) The current will flow clockwise and be increasing.
• B) The current will flow clockwise and be decreasing.
• C) The current will flow counter-clockwise and be increasing.
• D) The current will flow counter-clockwise and be decreasing.
• E) The induced current will be zero.

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Definitions:

Cervical Plexus

A network of nerves in the neck that supplies movement and sensation to the neck, upper shoulders, and part of the arms.

Patellar Reflex

A reflex action in which the patellar tendon is tapped, causing the quadriceps muscle to contract and kick the lower leg forward.

Rectus Femoris Muscle

A muscle of the anterior thigh that is part of the quadriceps group, involved in knee extension and hip flexion.

Proprioceptor

Sensory receptors found in muscles and tendons that provide information about body position and movement.