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Questions  

If F is the force acting on a particle having position vector r and τ be the torque of this force about the origin, then

a
r→.τ→ not equal to zero and F→.τ→ = 0
b
r→.τ→ > 0 and F→.τ→<0
c
r→.τ→= 0  and F→.τ→ = 0
d
r→.τ→ = 0 abd F→.τ→ not equal to zero

detailed solution

Correct option is C

Torque is an axial vector, i.e., its direction is always perpendicular to the plane containing vectors r→ and F→.τ→ = r→ ×F→Torque is perpendicular to both r→ and F→τ→.r→ = 0F→.τ→ = 0

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