In models of magnetic and electric fields, why are field vectors depicted by arrows? A. because they represent their direction, but not their magnitude

B. because they represent their magnitude, but not their direction

C. because they represent both their magnitude and direction

D. because they represent a parameter that is neither their magnitude nor direction

Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.

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Why does lightning travel from clouds to the ground?