What Is the Direction of Induced Current in Copper and Glass Tubes?

[Precursor]

Homework Statement

A magnet is dropped down each the copper and glass tube. What direction is the induced current in the copper and glass tube respectively?

a)clockwise, clockwise
b)clockwise, no induced current
c)counter clockwise, clockwise
d)counter clockwise, no induced current

Homework Equations

None are necessary.

The Attempt at a Solution

I think the answer is b) clockwise, no induced current. Using the left hand rule the direction of the magnetic field in the copper tube is upwards and the direction of the current is clockwise. Current cannot be induced in a glass tube. Am I right?

 

[rl.bhat]

Your answer is correct.

 

[thomate1]

Yes, you are correct. The answer is b) clockwise, no induced current. When a magnet is dropped down a copper tube, the changing magnetic field induces a current in the copper tube, creating a magnetic field that opposes the initial field. This current flows in a clockwise direction. However, in a glass tube, there is no conducting material for the induced current to flow through, so no current is induced.