Choose the correct option for the following Assertion (A) and Reason (R).

Physics · Properties of solid and fluid · viscosity and terminal velocity

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Choose the correct option for the following Assertion (A) and Reason (R).

Assertion

For equal-material spheres falling terminally in the same viscous medium under Stokes' law, the rate of viscous heat production varies as the fifth power of the sphere radius.

Reason

Stokes drag is proportional to rv, while terminal speed is proportional to r².

Options

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