Question

1. Which is true about the behavior of magnets?

a. Both like and unlike poles can attract and repel each other depending on the surrounding materials.
b. Like poles repel each other, and unlike poles attract each other.
c. Like poles attract each other, and unlike poles repel each other.
d. None of the above are true.
2. According to the right-hand rule, if a current-carrying wire is grasped in the right hand with the thumb in the direction of the current, the four fingers will curl in the direction of the…
a. Domain
b. Magnetic field
c. North pole
d. South pole
3. To make an electromagnet stronger, it would be best to…
a. increase the current through the wire
b. decrease the current through the wire
c. increase the number of loops of wire
d. Both a. and c. are correct.
4. Choose the statement below that is FALSE about the magnetic field, B, around a current-carrying wire.
a. B is proportional to the current in the wire.
b. B is inversely proportional to the distance from the wire.
c. The lines of B form concentric circles about the wire.
d. B is independent of the current in the wire.

Answer 1

1.A
2.B
3.D
4.C
Hope this helps

Answer 2

1.

Answer:

b. Like poles repel each other, and unlike poles attract each other.

Step-by-step explanation:

here two opposite poles are showing similar behavior of attraction or repulsion between magnets as that of nature of two opposite charges.

2.

Answer:

Magnetic field

Step-by-step explanation:

This is right hand thumb rule according to which the magnetic field will along curl of fingers if thumb is along magnetic field.

3.

Answer:

d. Both a. and c. are correct.

Step-by-step explanation:

Magnetic field due to a closed loop is given by

`B = (\mu_0 Ni)/(2r)`

so here in order to increase the magnetic field we have to increase the number of loops and current.

4.

Answer:

d. B is independent of the current in the wire.

Step-by-step explanation:

As we know that the magnetic due to a wire carrying current is given by

`B = (\mu_0 i)/(2\pi r)`

so here we can say that

a. B is proportional to the current in the wire.

b. B is inversely proportional to the distance from the wire.

c. The lines of B form concentric circles about the wire.

so here FALSE statement will be

d. B is independent of the current in the wire.