Question

A spherical ball of iron of radius 2 mm is falling through a column of glycerine. If densities of glycerine and iron are respectively 1.3 × 10³ kg/ m3 and 8 × 103 kg/m³ , h for glycerine = 0.83 Nm^{– 2} sec, then the terminal velocity is 

(a) 0.7 m/s 

(b) 0.07 m/s 

(c) 0.007 m/s 

(d) 0.0007 m/s

Answer 1

Correct option: (b) 0.07 m/s

Explanation:

Given : emf e = 2.1 V I = 0.2 A, R = 10Ω Internal resistance r = ?

From formula.