Acompass needle normally points toward earth’s magnetic pole, which is near the north pole. which best explains why the needle moves away from the pole when it comes close to a current-carrying wire?
a. current within the wire weakens the magnetic force of the pole.
b. magnetism surrounding the wire weakens the magnetic force of the pole.
c. magnetism surrounding the wire draws the needle toward the wire.

The three classes of rocks are sedimentary, metamorphic, and igneous. how are rocks classified into one of these three groups?

Intro: a solid ball of radius rb has a uniform charge density ρ. part a: what is the magnitude of the electric field e(r) at a distance r> rb from the center of the ball? express your answer in terms of ρ, rb, r, and ϵ0. part b: what is the magnitude of the electric field e(r) at a distance r express your answer in terms of ρ, rb, r, and ϵ0. part c: let e(r) represent the electric field due to the charged ball throughout all of space. which of the following statements about the electric field are true? check all that apply. e(0) = 0 e(rb)=0 limr→∞e(r)=0 the maximum electric field occurs when r=0 the maximum electric field occurs when r=rb the maximum electric field occurs as r→∞.

Awind turbine is rotating counterclockwise at 0.626 rev/s and slows to a stop in 12.9 s. its blades are 17.9 m in length. what is the centripetal acceleration of the tip of the blades at t=0~\text{s}t=0 s?