1) If a bar magnet is divided into two equal pieces, A) the north and south pole
ID: 2064417 • Letter: 1
Question
1) If a bar magnet is divided into two equal pieces,A) the north and south poles are separated.
B) two magnets result.
C) the magnet properties are destroyed.
D) an electric field is created.
2) Which of the following is correct?
A) When a current carrying wire is in your right hand, thumb in the direction of the magnetic field lines, your fingers point in the direction of the current.
B) When a current carrying wire is in your left hand, thumb in the direction of the magnetic field lines, your fingers point in the direction of the current.
C) When a current carrying wire is in your right hand, thumb in the direction of the current, and your fingers point in the direction of the magnetic field lines.
D) When a current carrying wire is in your left hand, thumb in the direction of the current, your fingers point in the direction of the magnetic field lines.
3) What fundamental fact underlies the operation of essentially all electric motors?
A) Opposite electric charges attract and like charges repel.
B) A current-carrying conductor placed perpendicular to a magnetic field will experience a force.
C) Alternating current and direct current are both capable of doing work.
D) Iron is the only element that is magnetic.
E) A magnetic north pole carries a positive electric charge, and a magnetic south pole carries a negative electric charge.
4) A stationary proton is in a uniform magnetic field of 0.20 T. What is the magnitude of the magnetic force on the proton?
5) An electron moves with a speed of 8.0 x 106 m/s along the +X-axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +X-axis and lying in the XY plane. Calculate the magnetic force of the electron.
Explanation / Answer
1) B
2) c
3)B
4) Force = charge x velocity x magnetic field x sin
as velocity is zero
Force = 0
5) Force = charge x velocity x magnetic field x sin
= 1.6x10-19 x 8x106 x 2.5 x sin 60
=2.77 x 10-12 N
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