For the following questions answer them individually
Which of the following instruments has the highest torque/weight ratio among the given instruments ?
If current through the operating coil of a moving iron instrument is doubled, the operation force becomes
A moving coil instrument has a resistance of $$10Ω$$ and gives full scale deflection at 0.5 V potential difference across it. How can it be adapted to measure a current upto 100 A ?
The multiplying power of the shunt of a milliammeter is 8. If the circuit is 200 mA, then current through the meter is