The earth's magnetic field
a) is slightly off centre compared to the Earth's rotational axis of rotation
b) has its magnetic south pole at the geographic north pole
c) attracts the north end of the compass needle to the geographic north pole
d) all of the above
Would it be d?
2. A magnetic field line is:
a) a line that shows the direction in which the field is getting smaller
b) a line that points towards the strongest magnetic field
c) a line drawn to represent the direction the magnetic field traces out through space
d) none of the above
would it be c?
3. Which of the following is not an advantage of AC circuits
a) they have the ability to transmit electricity over larger distances, with fewer energy losses
b) They have cheaper and simpler generators
c) they are more reliable systems for adjusting voltage and current
d) they have the ability to run most portable electronics directly from a wall outlet without a transformer
would it be b?
2, yes c
3. is D. You need a transformer and rectifier in the little box you plug in to the wall to charge your cell phone.
Yes, your answers are correct:
1. The correct answer is d) all of the above. The earth's magnetic field is slightly off-centre compared to the Earth's rotational axis of rotation, it has its magnetic south pole at the geographic north pole, and it attracts the north end of the compass needle to the geographic north pole.
2. The correct answer is c) a line drawn to represent the direction the magnetic field traces out through space. A magnetic field line is a line that shows the direction and shape of the magnetic field.
3. The correct answer is b) They have cheaper and simpler generators. This is not an advantage of AC circuits. AC circuits do have the other advantages mentioned.
1. The correct answer is d) all of the above.
To determine the answer, let's break down each option:
a) The Earth's magnetic field is slightly off center compared to the Earth's rotational axis of rotation. This is because the Earth's magnetic field is generated by the movement of molten iron in the Earth's outer core. This movement is influenced by various factors, including the rotation of the Earth.
b) The magnetic south pole of the Earth's magnetic field is indeed located near the geographic north pole. Magnetism works in a way that opposite poles attract each other. Therefore, the north end of the compass needle is attracted to the geographic north pole, which is the Earth's magnetic south pole.
c) As mentioned above, the north end of the compass needle is attracted to the geographic north pole. This is due to the Earth's magnetic field's influence on the compass needle's magnetic properties.
Therefore, all three options are correct, making the answer d) all of the above.
2. The correct answer is c) a line drawn to represent the direction the magnetic field traces out through space.
To determine the answer, let's evaluate each option:
a) A line that shows the direction in which the field is getting smaller is not defining a magnetic field line. Magnetic field lines represent the direction of the magnetic field, not the change in the field's strength.
b) A line that points towards the strongest magnetic field is also not correct. Magnetic field lines do not point towards the strongest magnetic field; they represent the direction of the field.
c) A line drawn to represent the direction the magnetic field traces out through space is the correct definition. Magnetic field lines are imaginary lines drawn in a way that their direction indicates the path a compass needle or a charged particle would follow in the magnetic field.
Therefore, the answer is c) a line drawn to represent the direction the magnetic field traces out through space.
3. The correct answer is a) they have the ability to transmit electricity over larger distances, with fewer energy losses.
To determine the answer, let's evaluate each option:
a) AC circuits, or alternating current circuits, have the advantage of transmitting electricity over larger distances with fewer energy losses. This is because transformers can easily change the voltage levels of AC electricity, allowing efficient transmission over long distances. It's one of the reasons AC is commonly used in power transmission.
b) AC circuits do not necessarily have cheaper and simpler generators. Both AC and DC (direct current) generators have their own complexities and costs depending on the scale and application.
c) AC circuits are reliable systems for adjusting voltage and current. This is because transformers and various control devices can be efficiently used in AC circuits to adjust voltage and current levels as needed.
d) AC circuits do have the ability to run most portable electronics directly from a wall outlet without a transformer. This is because the standard voltage and frequency used in wall outlets (in most countries) match the requirements of most portable electronic devices.
Therefore, the answer is b) they have cheaper and simpler generators, which is not an advantage of AC circuits.
1. a
If you look at a maritime chart you will see that true north is up toward the top of the page but magnetic north is a different direction, here about 17 degrees to the west for example.