lenz law

A circular conducting loop is in a region of magnetic field B directed out of the page, as shown below. The magnitude of the magnetic field is decreasing. The direction of the induced current in the loop is

• Clockwise

• counterclockwise

• Undefined because the current is zero

• Impossible to determine without knowing the rate of change of field

Tags

NGSS.HS-PS2-5

According to Lenz’s law the direction of an induced current in a conductor will be that which tends to produce which of the following effects?

• enhance the effect which produces it

• produce a greater heating effect

• produce the greatest voltage

• oppose the effect which produces it

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

The figure shows a bar magnet moving vertically upward toward a horizontal coil. The poles of the bar magnets are labeled X and Y. As the bar magnet approaches the coil it induces an electric current in the direction indicated on the figure (counter- clockwise as viewed from above). What are the correct polarities of the magnet?

• X is a north pole,Y is a south pole

• X is a south pole,Y is a north pole

• Both X and Y are north poles

• Both X and Y are south poles

Tags

NGSS.HS-PS2-5

Determine the direction of induced current if the magnetic field is increasing.

• Clockwise

• Counter clockwise

• No induced current

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Determine the direction of induced current if the magnetic field is decreasing.

• Clockwise

• Counter clockwise

• No induced current

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Determine the direction of induced current if the magnetic field is constant.

• Clockwise

• Counter clockwise

• No induced current

Tags

NGSS.HS-PS2-5

Determine the direction of the current across the resistor ab when coil B is brought closer to coil A while the switch S is closed.

• a to b

• b to a

• no current

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5