quiz for my cute crow

A phenomenon produced by the motion of electric charge; attractive and repulsive forces between object

• MAGNETISM

• MAGNETIC FIELD

• MOVING CHARGE

• MAGNETIC DOMAIN

He is known for observing that a compass needle deflects when placed near a wire carrying a current.

Clusters of aligned atoms; interaction among adjacent iron atoms (lined up w/ one another)

• MAGNETIC DOMAIN

• MAGNETIC DECLINATION

• MOVING CHARGE

• MAGNETIC FIELD

A stronger electromagnet can be made with

• lesser loops

• longer length

• lower voltage

• more loops

In the region just outside the south pole of a magnet, the magnetic field lines

• are less concentrated than at the north pole

• go around the south pole

• point towards the south pole

• point away from the south pole

A positive charge moving with a constant velocity v enters a region of a uniform magnetic field pointing out of the page. What is the direction of the magnetic force on the charge?

• Upward

• Downward

• Into the page

• Out of the page

Which of the following will produce a magnetic field? (Choose all that apply)

• Magnet

• Earth

• Any Metal

• A wire with current flowing within

A bar magnet is divided into two. Which of the following is TRUE?

• Magnetism is lost

• Magnetic poles will be separated

• Bar magnet will maintain its polarity

• An electric field is created

What is the relationship between the number of coils in a solenoid and the EMF induced in it by a change in the magnetic flux through the solenoid?

• The induced EMF is inversely proportional to the number of coils in a solenoid

• The induced EMF is directly proportional to the number of coils in a solenoid

• The induced EMF is inversely proportional to the square of the number of coils in a solenoid.

• The induced EMF is proportional to the square of the number of coils in a solenoid.

PROBLEM SOLVING: A coil with 50 turns of wire is wrapped on a 3m square frame. Each turn has the same area, equal to that of the frame, and the total resistance of the coil is 4 ohm. The angle between the uniform magnetic field and the normal vector of the coil is zero. If the field changes uniformly from 3T to 5.25T in 0.5 s, find the magnitude of the induced EMF in the coil while the field has changed.