Exam 29: Magnetic Fields

A current loop is oriented in three different positions relative to a uniform magnetic field.In position 1 the plane of the loop is perpendicular to the field lines.In position 2 and 3 the plane of the loop is parallel to the field as shown.The torque on the loop is maximum in

The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page,the direction of the magnetic field at point P is

A charged particle (m = 2.0 g,q = −50 μC)moves in a region of uniform field along a helical path (radius = 4.0 cm,pitch = 8.0 cm)as shown.What is the angle between the velocity of the particle and the magnetic field?

A proton is accelerated from rest through a potential difference of 150 V.It then enters a region of uniform magnetic field and moves in a circular path (radius = 12 cm).What is the magnitude of the magnetic field in this region?

A magnetic field of 2.00 T is applied to a bubble chamber to make the tracks of protons and other charged particles identifiable by the radius of the circles they move in.If a high-energy proton moves along an arc of a 3.30-m circle,what is the momentum of the proton? [q = 1.60 × 10−¹⁹ C,m = 1.67 × 10−²⁷ kg]

A 2.0-C charge moves with a velocity of ( )m/s and experiences a magnetic force of ( )N)The x component of the magnetic field is equal to zero.Determine the y component of the magnetic field.

What is the radius of curvature of the path of a 3.0-keV proton in a perpendicular magnetic field of magnitude 0.80 T?

A 2.0-m wire carries a current of 15 A directed along the positive x axis in a region where the magnetic field is uniform and given by B = (30 − 40 )mT)What is the resulting magnetic force on the wire?

A particle (m = 3.0 μg,q = 5.0 μC)moves in a uniform magnetic field given by ( )mT)At t = 0 the velocity of the particle is equal to ( )m/s.The subsequent path of the particle is

A charged particle (mass = M,charge = Q > 0)moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction.What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with a speed V?

A rectangular coil (0.20 m × 0.80 m)has 200 turns and is in a uniform magnetic field of 0.30 T.When the orientation of the coil is varied through all possible positions,the maximum torque on the coil by magnetic forces is 0.080 N ⋅ m.What is the current in the coil?

At what speed would a proton need to circle the Earth at a height of 1 000 km above the equator if the Earth's magnetic field is horizontal and directed north-south,with an intensity of 4.00 × 10−⁸ T? (The radius of the Earth is 6 400 km and the charge and mass of the proton are q = 1.60 × 10−¹⁹ C and m_p = 1.67 × 10−²⁷ kg.Ignore relativistic corrections. )

A charged particle (mass = M,charge = Q > 0)moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction.What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with speed V?

The boundary shown is that of a uniform magnetic field directed in the positive z direction.An electron enters the magnetic field with a velocity pointing along the x axis and exits 0.63 μs later at point A.What is the magnitude of the magnetic field?

A charged particle (m = 5.0 g,q = −70 μC)moves horizontally at a constant speed of 30 km/s in a region where the free fall gravitational acceleration is 9.8 m/s² downward,the electric field is 700 N/C upward,and the magnetic field is perpendicular to the velocity of the particle.What is the magnitude of the magnetic field in this region?

A straight 10-cm wire bent at its midpoint so as to form an angle of 90° carries a current of 10 A.It lies in the xy plane in a region where the magnetic field is in the positive z direction and has a constant magnitude of 3.0 mT.What is the magnitude of the magnetic force on this wire?

A proton with a kinetic energy of 0.20 keV follows a circular path in a region where the magnetic field is uniform and has a magnitude of 60 mT.What is the radius of this path?

A segment of wire carries a current of 25 A along the x axis from x = −2.0 m to x = 0 and then along the z axis from z = 0 to z = 3.0m.In this region of space,the magnetic field is equal to 40 mT in the positive z direction.What is the magnitude of the force on this segment of wire?

The magnetic field in a region of space is parallel to the surface of a long flat table.Imagine that this page is lying flat on the table.When current is present in the coil,which is lying on the table,the coil tends to rotate so that the left side moves up and the right side moves down.The magnetic field is

A charged particle (mass = 4.0 μg,charge = 5.0 μC)moves in a region where the only force on it is magnetic.What is the magnitude of the acceleration of the particle at a point where the speed of the particle is 5.0 km/s,the magnitude of the magnetic field is 8.0 mT,and the angle between the direction of the magnetic field and the velocity of the particle is 60°?