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The angle of twist is _______ proportional to the twisting moment.

Directly Inversely Either (A) or (B) Neither (A) nor (B)

Explanation:

Torsion equation:

$\frac{T}{J} = \frac{τ_{m a x}}{r} = \frac{G θ}{L}$

Here:

T = torque or twisting moment(Nm)
J = polar moment of inertia or polar second moment of area about shaft axis (m⁴ ) for circular bar J = $\frac{π d^{4}}{32}$ ,
τ_max = shear stress at outer fiber
r = radius of the shaft,
G = modulus of rigidity or shear modulus, θ = angle of twist, (rad), L = length of the shaft(m)

so from the above expression, we can say that θ (Angle of twist) is directly proportional to T (Twisting Moment)

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