Correct Answer - Option 2 : 11.11 mA

**Concept:**

PMMC torque equation

T_{d} = T_{c}

T_{d} = deflecting torque

T_{d} = BINA

where B = flux density

I = current in moving coil

N = number of turns of the coil

A = effective Area of coil

T_{c} = controlling torque

T_{c} = Kθ

K = spring constant

θ = deflection Angle.

Kθ = BINA

**Calculation:**

Given:

θ = 100°, N = 60, B = 0.5T, l = 25mm, W = 18 mm

Area (A) = l × W = 25 × 18 = 450 mm^{2} = 450 × 10^{-6} m^{2}

K = 1.5 × 10^{-6} N-m/degree

By torque equation

Kθ = BINA

1.5 × 10^{-6} × 100 = 0.5 × I × 60 × 450 × 10^{-6}

I = 11.11 mA