Question

An object is at a distance of 8cm from a concave mirror. The focal distance of the mirror is 12cm. What is the location of the image?

multiple choice:

1) -16 cm

2) -24 cm

3) 4 cm

4) 16 cm

What is the reactance of a 20μF capacitor when the frequency of the power source is 50Hz?

multiple choices:

1) 272 ohms

2) 159 ohms

3) 63 ohms

4) 198 ohms

Answer 1

- Answer D Given; Object distance, Uz -8em... focal length ; fe -12cm (concave) Image distance ; v: 9 from mirror equation; ti Štt se Iz -14 + I : Ù. le - 8+12 V ir 12x8. v + 12 x 8 m 2 + 2) Option (2) is correct. Because But the sign seems to be confusing. CScanned with CamScanner t o

2) Given ; ce 20x106 F fa 50 Hz w = 2If a 10o 2 x 3-14 x 50 = 314 radis Ree Capacitive reactanu ; Xce ? 20x80 6x 314 = 1592 -> Option (2) CScanned with CamScanner