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A uniform 1 T magnetic field is directed vertically downward in a region of space. A...

A uniform 1 T magnetic field is directed vertically downward in a region of space. A proton traveling at 105 m/s in a horizontal plane and aimed northward enters this region. The initial acceleration of the proton is (a) 1.6 x10^-14 m/s2 westward, (b) 9.6 x 10^12 m/s2 eastward, (c) 1.6 x 10^-14 m/s2 eastward, (d) 9.6 x 10^12 m/s2 westward.

A 5 m long straight wire carries a current of 5 A directed north (ignore the rest of the circuit). The magnitude of the force on this section of wire in a region where a uniform 5 T magnetic field points south is (a) 125 N, (b) 25 N, (c) 0 N, (d) depends on how the current completes the circuit.

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