The series resistance R to convert the galvanometer to a voltmeter is given by: R = V/Ig – Rg Substituting V = 15, Ig = 30 × 0.005 A. Rg = 20 Ω: R = 15/0.15 – 20 = ...

The voltage sensitivity of a galvanometer is given by: Voltage Sensitivity = Current Sensitivity/R If current sensitivity increases by 35% and resistance increases by a factor of 3, voltage sensitivity changes by: Change = 1.35/3 = 0.45 or 45% Answer: (B) 45%

To convert the galvanometer to a voltmeter of range 0–10 V, the series resistance R is given by: R = V/I – Rg Substituting V = 10V, I = 5 mA and Rg = 15 Ω: R = 10/0.005 – ...

The gyro-magnetic ratio of an electron in a hydrogen atom, according to the Bohr model, is negative because the electron has a negative charge. It remains independent of the orbit. Hence, the correct answer is (B) Negative.

To maximize torque, the magnetic moment (m = nIA) should be maximized. For a given length l, the area A is maximum when the number of turns n = 1, forming the largest possible radius. Hence, the correct answer is ...