An ac circuit has an rms current of 5A.Its peak current is nearly a. 7.1 A b. 5A

Question

An ac circuit has an rms current of 5A.Its peak current is nearly a. 7.1 A b. 5A c. 10A d. 3.5 A When a light ray passes from one medium to another medium, the parameter that remains the same is a. Frequency b. Wavelength c. All are incorrect. d. Velocity A converging lens of focal length 15 cm has an object placed at a distance of 20 cm from the lens. Position of the image, nature of the image, size of the image are a. -60 cm, real, diminished b. +60 cm, real, diminished c. +60 cm, real, enlarged d. +12 cm real diminished

Explanation / Answer

Answer:

(7) RMS current Irms = Ipeak / 2

Therefore, Ipeak = (1.414) (5 A) = 7.07 A ~ 7.1 A

Option (A) is correct.

(8) Frequency remains same.

(9) Given, focal length f = 15 cm, object distance u = 20 cm

Therefore, image distance v = (u x f) / (u - f) = (20 cm) (15 cm) / (20cm - 15 cm) = 60 cm

magnification M = - v / u = - 60 cm / 20 cm = -3 < 1. Image will be diminished.

So, answer is + 60 cm, real, diminished. Option(b) is correct.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.