do only question number 4 please lullply Find total potential energy of the syst

Question

do only question number 4 please

lullply Find total potential energy of the system. 50hm 2. Find DC currents (magnitudes and directions) in all resistors of the circuit shown. Find total power developing in Neglect internal resistances of the batteries. voltage between the points A and B. 3. A metal equilateral triangle of resistance 10 ohm and size 20 cm is pushed with a force of 02 N along one of its sides into a bomogenous magnetic field with constant speed Find strength of magnetic field. 4. An optical system is made of a converging lens focal distance 16 mm and a concave mirror ofradius 4 mm. Find distance between the images produced by this system if the object placed at a distance ot6 mm from the lens. The distance between the lens and mirror is 69 mm Draw the images in scale on the drawing below and compare the calculated values (image sizes and image distances) with those on the draaitgSm object

Explanation / Answer

For converging lens,

object distance, do1 = 26 mm

f1 = 15 mm

using lens equation,

1/f =1/di + 1/do

1/15 = 1/26 + 1/di1

di1 = 35.45 mm

now object distance for mirror,

do2 = 58.5 - 35.35 = 23.05 mm

f2 = 37 mm

1/37 = 1/23.05 + 1/di2

di2 = - 61.1 mm

minus sign indicates that image is virtial and to the right side of the mirror.

hence distance between image and object,

d = 26 + 58.5 + 61.1 =145.6 mm

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