A drum brake is shown in the figure. The drum is rotating

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A drum brake is shown in the figure. The drum is rotating in anticlockwise direction. The coefficient of friction between drum and shoe is 0.2. The dimensions shown in the figure are in mm. The braking torque (in Nm) for the brake shoe is________.

1. 64 N - M
2. 24 N - M
3. 11 N - M
4. None of the above

Correct Option: A

Taking moments about pin joint (SM)
⇒ 1000 × 0.8 =R_N × 0.48 + μR_N × 0.1

⇒ R_N =	800	= 1600
	0.5

T_B = μR_N × r

= 0.2 × 1600 ×	200	= 64 N - M
	1000