The next three problems concern the following situation A long straight wire pla

Question

The next three problems concern the following situation A long straight wire placed horizontally 1 m above the ground. The current in the wire is flowing to the right as shown in the picture. A wire loop is held above the wire and released so that it falls under the influence of gravity. As the loop falls toward the wire, the current in the loop will: A) Be zero B) Flow in a clockwise direction C) Flow in a counter-clockwise direction The acceleration of the loop is: A) Equal to g the acceleration of gravity B) Greater than g the acceleration of gravity C) Less than g the acceleration of gravity After the loop completely passes the wire and continues to current in the loop will: A) Be zero B) Flow in a clockwise direction C) Flow in a counter-clockwise direction

Explanation / Answer

a)

The current in the wire is out of page at the top of the wire and into the page at the bottom of the wire.

so when the field is out of page inside the loop then the current is moving in counter clockwise direction.

b)

The forces acting on the loop is the gravity and magnetic force. The magnetic force drive the loop outward while gravity pulls downward so the force is less than gravity .

c)

The current in the wire is out of page at the top of the wire and into the page at the bottom of the wire.

so when the field is into the page inside the loop then the current is moving in clockwise direction.

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