In a band and block brake, as shown in Figure 16.10 (a), the data are given as: \(n=12\), angle subtended by each block \(=30^{\circ}\), radius of drum \(=300 \mathrm{~mm}\), block thickness \(=40 \mathrm{~mm}, \mu=0.3\), \(a=400 \mathrm{~mm}, b=40 \mathrm{~mm}, \mathrm{~F}=400 \mathrm{~N}, l=800 \mathrm{~mm}\), Calculate the braking torque.