4.4 Magnetic Fields Recap

Which of these is correct?

• 
• 

Which of these is correct?

• 
• 

A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:

• Directed to the right

• Directed to the left

• Equal to the magnetic field

• In the same direction as the magnetic field

The magnetic field inside the coil shown below is directed:

• Into the page

• Out the Page

• To the left

• Towards the bottom of the page

In the figure, using the right hand rule around a solenoid, which of the below statements is correct:

• North Pole is 7 and South pole is 8

• North Pole is 8 and South Pole is 7

• There is no magnet, so no north or south

• The current is flowing in the direction from 7 to 8

Two parallel wires are separated by 40 cm. If the current in the second wire is twice the current in the first one, what happens to the wires?

• The magnetic force causes a repulsion between wires

• The magnetic force causes an attraction between the wires

What is this the definition for: a wire of length 1m carrying a current of 1A at a right angle to the magnetic field experiences a force of 1N.

Two long, parallel wires each carry the same current in the same direction. What is the total magnetic field at the point midway between the wires?

• Zero

• Directed into the page

• Directed out of the page

• Directed to the left

Solenoid 1 has a length L, cross-sectional area A, and N turns. Solenoid 2 has a length 2L, cross-sectional area 2A, and 2N turns. Which solenoid has the greater magnetic field at its centre when equal currents are going through them?

• 1

• 2

• Both have the same magnetic field.

• Since it depends on the values of A and L, none of the above are correct

Which of these equations shows the force on an individual charged particle?

• $F=Bqv\sin\theta$

• $F=BIl\sin\theta$

• $B=\mu_onI$