Two long wires carrying equal currents I are at right angles to each other, but don't quite touch. Describe the magnetic force one exerts on the other.

an electron beam is shot into into a region wehre there is both an electric field pointing upward of magnitude E=7.2N/C and a magnetic field B as shwon in the figure. While movoing through the region the electron beam stays in a straight line with speed v=140 m/s

a) in which direction does the electric force act on the electrons b) In order to keep the electrons in a straight line, in which direction should the magnetic force act c) What should the direction of the magnetic field be in order to produce the force in part b d) calculate the numerical value of the magnitude of the electric force F_e in newtons e) Calculate the magnitude of the magnetic field if the electron continues in a straight line, in tesla

A long, straight wire carrying a current of 305 A is placed in a uniform magnetic field that has a magnitude of $7.00 \times 10^{-3} \mathrm{T}$. The wire is perpendicular to the field. Find a point in space where the net magnetic field is zero. Locate this point by specifying its perpendicular distance from the wire.

A long solenoid has 1400 turns per meter of length, and it carries a current of 3.5 A. A small circular coil of wire is placed inside the solenoid with the normal to the coil oriented at an angle of

$$90.0^\circ$$

with respect to the axis of the solenoid. The coil consists of 50 turns, has an area of

$$1.2 \times 10 ^ { - 3 } \mathrm { m } ^ { 2 }$$

and carries a current of 0.50 A. Find the torque exerted on the coil.

Two insulated wires, each 2.40 m long, are taped together to form a two-wire unit that is 2.40 m long. One wire carries a current of 7.00 A; the other carries a smaller current I in the opposite direction. The two-wire unit is placed at an angle of

$$65.0^\circ$$

relative to a magnetic field whose magnitude is 0.360 T. The magnitude of the net magnetic force experienced by the two-wire unit is 3.13 N. What is the current I?

An unmagnetized nail will not attract an unmagnetized paper clip. However, if one end of the nail is in contact with a magnet, the other end will attract a paper clip. Explain.

A horizontal current-carrying wire, free to move in Earth's gravitational field, is suspended directly above a second, parallel, current-carrying wire. Can the upper wire be held in stable equilibrium due to the magnetic force of the lower wire? Explain.

A horizontal current-carrying wire, free to move in Earth's gravitational field, is suspended directly above a second, parallel, current-carrying wire. In what direction is the current in the lower wire?

If a negatively charged particle enters a region of uniform magnetic field which is perpendicular to the particle's velocity, will the kinetic energy of the particle increase. decrease, or stay the same? Explain your answer. (Neglect gravity and assume there is no electric field.)

Claudia is thinking of everything that she and her fiance, Ramón, should do to buy an apartment. Write what she will tell Ramón, using nosotros/as commands for the verbs in the infinitive. The first sentence has been done for you. Podemos pedir un préstamo para comprar un apartamento. Debemos llenar este formulario cuando solicitemos el préstamo. Tenemos que ahorrar dinero todos los meses hasta que paguemos el préstamo. No debemos cobrar los cheques que nos lleguen; debemos depositarlos en la cuenta corriente. Podemos depositar el dinero que nos regalen cuando nos casemos. Le debemos pedir prestado a mi padre un libro sobre cómo comprar una vivienda. Queremos buscar un apartamento que esté cerca de nuestros trabajos. No debemos ir al trabajo mañana por la mañana; debemos ir al banco a hablar con un empleado.

Pidamos un préstamo para comprar un apartamento.

Suppose the Earth's magnetic field at the equator has magnitude $0.40 \times 10^{-4} \mathrm{T}$ and a northerly direction at all points. Estimate the speed a singly ionized uranium ion (m = 238 u, q = e) would need to circle the Earth 5.0 km above the equator. Can you ignore gravity?

What is the maximum current that a wire can carry if an experimenter is performing an experiment $1.0$ m away that deals with the Earth's magnetic field, which she wishes to measure to $\plusmn 1$ percent?

How can you make a compass without using iron or other ferromagnetic material?

A beam of electrons is directed perpendicularly toward a horizontal wire carrying a current from left to right. In what direction are the electrons deflected?