List of top Transducers Questions

A current carrying semiconductor of thickness \(0.7\) mm is placed in a transverse magnetic field. The measured Hall voltage is \(0.9\) mV and the current is \(6\) mA. If the Hall coefficient is \(4 \times 10^{-4}\) \(\text{m}^3/\text{C}\), the value of the incident magnetic field is T (rounded off to two decimal places).

A parallel plate capacitive displacement sensor has a plate area of \(2\ \text{cm}^2\). The air gap between the plates is decreased by \(0.1\) mm from an initial value of \(0.5\) mm. The percentage change in the capacitance value is __________ %.
(Assume permittivity as \(\epsilon_0 = 8.854 \times 10^{-12}\ \text{F/m}\))