1) A magnetic dipole wants to A) align with the magnetic field B) be perpendicul
ID: 1348248 • Letter: 1
Question
1) A magnetic dipole wants to
A) align with the magnetic field
B) be perpendicular to the electric field
C) align with the electric field
D) lie opposite the magnetic field
E) lie opposite the electric field
F) be perpendicular to the magnetic field
2) A magnetic field is created by (select all that apply):
A) a magnetic charge
B) an electric dipole
C) electric current
D) an electric charge
E) a magnetic dipole
3)Magnetic field lines
A) exit - charges and enter + charges
B) exit + charges and enter - charges
C) are always perpendicular to the equipotentials
D) are always perpendicular to the E field lines
E) exit S poles and enter N poles
F) exit N poles and enter S poles
4.)You are looking down a wire that has current going directly away from you. Its magnetic field lines would be best described, from your perspective, as
A) circular & clockwise
B) circular & counterclockwise
C) radially inwards towards the wire
D) directly towards you
E) directly away from you
F) radially outwards from the wire
5)Somewhat Near the earth's north pole (for rotation) is the Earth's
A) + end of its electric dipole
B) South magnetic pole
C) - end of its electric dipole
D) North magnetic pole
6) You are a distance D from a wire carrying current. You then move to a distance 2D. You now experience
A) half the B field as before
B) one-fourth the B field as before
C) four times the B field as before
D) twice the B field as before
E) the same B field as before
Explanation / Answer
I will try to explain all the answers.
1) The magnetic dipole wants to allign with the magnetic field- The North pole of dipole A attracts the south pole of dipole B and viceversa.
2) An electric current can create a magnetic field, (Ampere´s law) an a dipole magnetic also can create a magnetic field, so the answers are C) and E).
3) Exit North pole and enter south poles, therefore the answer is F).
4) The magnetic field is given by circular lines and clockwise, (Biot-Savart´s law)
5) It is located the south magnetic pole.
6) I would be experiencing a half the B field as before (Ampere´s law)
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