Lenz and Faraday!

A flat coil consists of 20 turns each of area

an area of 50 cm2, is positioned perpendicularly to a uniform magnetic field that increases its magnitude at a constant rate from 2.0 T to 6.0 T in 2.0 s. If the coil has a total resistance of 0.40 ohms , what is the magnitude of the induced current?

• 70 mA

• 140 mA

• 500 mA

• 800 mA

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

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

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

NGSS.HS-PS3-5

A conducting ring is moving from left to right through a region that contains a constant magnetic field as shown in the diagram. In which region is there an induced current in the ring?

• A and E

• B and D

• B,C and D

• A,B,C and D

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

A uniform 4.5 T magnetic field passes perpendicularly through the plane of wire loop 0.10 m² in area. What flux passes through the loop?

• 5.00 Tm²

• 0.450 Tm²

• 0.250 Tm²

• 0.135 Tm²

Tags

NGSS.HS-PS3-5

A coil in a magnetic field encloses a flux of 0.256 Tm² when the angle between the normal to the coil and the direction of the magnetic field is 70.0°. What flux would go through the coil if the angle were changed to 40.0°?

• 0.332 T·m²

• 0.198 T·m²

• 0.114 T·m²

• 0.573 T·m²

Tags

NGSS.HS-PS3-5

What is the direction of the induced magnetic field?

• Left
• Right
• Up
• Down

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

What is the direction of the induced magnetic field?

• Left
• Right
• Up
• Down

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

In what direction is the magnet moving?

• Left
• Right
• Up
• Down

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Which side of the coil above will be north?

• Right side

• Left side

Tags

NGSS.HS-PS2-5