A copper guillotine blade falls toward a victim. It enters the field from strong

Question

A copper guillotine blade falls toward a victim. It enters the field from strong magnets on way down. Model the blade as a square loop, and the field as a uniform with limited spatial extent.

1) What is the direction of the current induced in the loop (blade) as it enters the field?

a) Clockwise b)Counter Clockwise c) Depends on field direction

2)What is the direction of the magnetic force on the blade (loop) as it enters the field region?

a)Up b)Down c)Left d)Right e)Depends on field direction

A copper guillotine blade falls toward a victim. It enters the field from strong magnets on way down. Model the blade as a square loop, and the field as a uniform with limited spatial extent. 1) What is the direction of the current induced in the loop (blade) as it enters the field? a) Clockwise b)Counter Clockwise c) Depends on field direction 2)What is the direction of the magnetic force on the blade (loop) as it enters the field region? a)Up b)Down c)Left d)Right e)Depends on field direction

Explanation / Answer

a) The direction of the induced current:

The magnetic flux is increased, so the induced magnetic field is out the page so the induced current is counter clockwise.

b) Electric current is to the right using the rifght hand rule the magnetic force is UP

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