Exam 26: The Magnetic Field

A small positively charged body is moving horizontally and westward.If it enters a uniform horizontal magnetic field that is directed from north to south,the body is deflected

Which of the following statements is false?

A beam of electrons moving at a speed of 8 $\times$ 10⁴ m/s is undeflected when it passes through an electric field of 5 N/C perpendicular to its path and a magnetic field that is perpendicular to its path and also to that of the electric field.Calculate the strength of the magnetic field.

A proton with a charge +e is moving with a speed v at 50º to the direction of a magnetic field .The component of the resulting force on the proton in the direction of is

The SI unit of magnetic field is the tesla (T).This is equivalent to

An electric field of 3.0 kV/m is perpendicular to a magnetic field of 0.20 T.An electron moving in a direction perpendicular to both and is not deflected if it has a velocity of

If the magnetic field vector is directed toward the north and a positively charged particle is moving toward the east,what is the direction of the magnetic force on the particle?

In a mass spectrometer ions of Ni with mass 9.62 $\times$ 10^-26 kg and charge +2e are accelerated through a potential difference of X volts and then deflected in a magnetic field of 0.15 T.If the radius of curvature of the ions is 0.55 m,then calculate the value of the potential difference X.

When a compass needle is in stable equilibrium in a magnetic field ,

The radius of curvature of the path of a charged particle moving perpendicular to a magnetic field is given by

Use the diagram for the next problem. -A circular current loop lies in the xy plane and has radius R = 10 cm.The loop has 20 turns and carries a current I = 4 A.A magnetic field of strength 0.3 T is applied at an angle of $\theta$ = 30 ^$\circ$ to the loop.The potential energy of the magnetic dipole is

A beam of charged particles moving with a speed of 10⁶ m/s enters a uniform magnetic field of 0.1 T at right angles to the direction of motion.If the particles move in a radius of 0.2 m,then calculate their period of motion.

A circular,20-turn coil has a radius of 5.0 cm.What is the magnitude of the magnetic moment of the coil when it carries a current of 2.5 A?

A positively charged particle is moving northward in a magnetic field.The magnetic force on the particle is toward the northeast.What is the direction of the magnetic field?

A circular,20-turn coil of radius 5.0 cm is oriented in such a way that its axis makes a 30º angle with a uniform magnetic field of 0.15 T.What is the torque on the coil when it carries a current of 2.5 A?

The radius of curvature of the path of a charged particle in a uniform magnetic field is directly proportional to

An electron passes through a region where there is an electric field E = 4.0 $\times$ 10⁵ V/m and a magnetic field B = 0.090 T.The directions of the electric field,the magnetic field,and the electron velocity are mutually perpendicular.If the electron is not deflected from its straight-line path through these fields,its velocity must be

Which of the following statements correctly describes the torque-potential energy relationship for a current-carrying coil in a uniform magnetic field?

A charged particle is moving horizontally westward with a velocity of 3.5 $\times$ 10⁶ m/s in a region where there is a magnetic field of magnitude 5.6 $\times$ 10^-5 T directed vertically downward.The particle experiences a force of 7.8 $\times$ 10^-16 N northward.What is the charge on the particle?

The radius of the orbit of an electron moving with a speed of 10⁸ m/s perpendicular to a magnetic field of 5.0 $\times$ 10^-3 T is approximately