An ammeter is to be constructed which can read currents up to 2 A. If the coil has a resistance of 25 ohm and takes 1 mA for full-scale deflection, what should be the resistance of the shunt used ?

Q. An ammeter is to be constructed which can read currents up to 2 A. If the coil has a resistance of 25 ohm and takes 1 mA for full-scale deflection, what should be the resistance of the shunt used ? (a) 12.5 mΩ (b) 1.25 mΩ (c) 125 mΩ (d) 0.125 mΩ Ans: A

The potentiometer wire AB shown in figure is 50cm long. When AD = 30cm, no deflection occurs in the galvanometer. Find R

Q. The potentiometer wire AB shown in figure is 50cm long. When AD = 30cm, no deflection occurs in the galvanometer. Find R (a) 3Ω (b) 3.5Ω (c) 4Ω (d)2.5Ω Ans: C