# Solved >     71.  A charged particle of enters:1463286 …

71.  A charged particle of enters a region of magnetic field at a speed of 2.8 x 106 m/s, at an angle of 37 degrees relative to the magnetic field direction. If the magnetic field strength is 1.2 T and the charge of the particle is +e, and the radius of the helical path is 8.9 cm, what is the particle’s mass?
A.  7.7 x 10-27 kg
B.  6.1 x 10-27 kg
C.  insufficient information given.
D.  1.0 x 10-26 kg

72.  A charged particle of mass 1.0 x 10-26 kg enters a region of magnetic field at a speed of 2.8 x 106m/s, at an angle of 37 degrees relative to the magnetic field direction. If the magnetic field strength is 1.2 T what will be the radius of the helical path it takes?
A.  Insufficient information given.
B.  15 cm
C.  8.9 cm.
D.  11 cm

73.  A wire bearing current of 1.25 A crosses a region in which there is a uniform B field in the +y direction.  The wire is inclined at an angle of 75 degrees above the +x direction.  What is the magnitude of the force on the wire, if the magnetic field region spans 15 cm in the x direction?
A.  0.19 N
B.  0.70 N
C.  0.18 N
D.  0.05 N

74.  A 2.5 cm-long horizontal wire segment has mass 0.15 g and carries a current sufficiently large that it levitates when the segment is in a region of B field upward with magnitude 1.5 T.  The current is passed to the segment that is in the magnetic field by way of massless electrical leads.  What is the magnitude of the current that the wire carries?
A.  39 mA
B.  25 A
C.  4.0 mA
D.  Not enough information is given.

75.  A coil of 150 turns of wire is in the form of a circle of diameter 7.5 cm, and sits in the center of a dipole magnet that produces a uniform magnetic field of strength 1.5 T.  The torque on the coil has a maximum value of 0.25 Nm.  What is the current in the coils?
A.  9.4 A
B.  200 mA
C.  4.7 mA
D.  63 mA
E.  94 mA

76.  A coil of 150 turns of wire is in the form of a circle, carries a current of 63 mA, and sits in the center of a dipole magnet that produces a uniform magnetic field of strength 1.5 T.  The torque on the coil has a maximum value of 0.25 Nm.  What is the radius of the coils?
A.  9.2 cm
B.  13 cm
C.  0.56 cm
D.  7.5 cm

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