The coil of a moving coil voltmeter is 40 mm long and 30 mm wide and has 100 turns on it. The control spring exerts a torque of 240×10−6N−m when the deflection is 100 divisions on full scale. If the flux density of the magnetic field in the airgap is 1.0Wb/m2, the resistance that must be put in series with the coil to give one volt per division is ________Ω. (Assume resistance of the voltmeter coil is negligible)