Question

read it! electric and magnetic forces - questions

1. what makes magnetic objects different from non - magnetic objects?

a. electrons spin in different, random directions.
b. electrons spin in the same direction.
c. magnetic force flows from the north to the sides.
d. magnetic force flows from the south to the sides.

1. just like the n and s poles on bar magnets, electrons and protons ____ each other.

a. attract
b. repel
c. repulse
d. push apart

1. when an electric current flows through a wire, a magnetic field is created. to increase the power of the magnetic field, ____________.

a. decrease the number of coils in the wire
b. keep the same number of coils in the wire
c. increase the number of coils in the wire
d. remove all coils from the wire

Explanation:

1. In magnetic objects, electrons spin in the same direction, which creates a net magnetic - field. In non - magnetic objects, electrons spin in different, random directions and their magnetic fields cancel out.
2. Electrons are negatively charged and protons are positively charged. Opposite charges attract each other, similar to how the N and S poles of a bar magnet attract.
3. The strength of the magnetic field created by an electric current in a wire can be increased by increasing the number of coils in the wire. This is because each coil contributes to the overall magnetic field.

Answer:

1. B. Electrons spin in the same direction.
2. A. attract
3. C. increase the number of coils in the wire