The correct answer is (A) E = 0, B = 0. Since the proton moves with constant velocity without changing direction or speed, no net force acts on it. Hence, both electric and magnetic fields must be zero to maintain ...

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.