Consider a wire that has resistance r, length l and the cross-sectional area a. the correct expression for the resistivity of that wire is:

Explanation:

.As we know that the resistance of the wire is given as

here we know that

A = cross-sectional area

L = length

R = resistance of wire

now multiply both sides of above equation with Area

now divide both sides with length of the wire

so above is the expression of resistivity of wire in terms of resistance, Area and length of the wire

when earth is in rotational motion around the sun,it displaces from its place.

when a ball is placed on an inclined surface it does both the rotational and circular motion.

explanation:

terd muffin is the correct answer