A wire 2.80 m in length carries a current of 4.20 A in a region where a uniform magnetic field has a magnitude of 0.260 T. Calculate the magnitude of the magnetic force on the wire assuming the following angles between the magnetic field and the current.

The earth remains in orbit around the sun due to the force of gravity. how does the force of gravity exerted by the sun on the earth compare to the force of gravity exerted by the earth on the sun?

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.