Question

A galvanometer of resistance 100 Ω is converted into an ammeter of range (0 − 1 A) using a resistance of 0.1 Ω. The ammeter will show full scale deflection for a current of about ______.

विकल्प

• 0.1 mA

• 1 mA

• 10 mA

• 0.1 A

Answer 1

A galvanometer of resistance 100 Ω is converted into an ammeter of range (0 − 1 A) using a resistance of 0.1 Ω. The ammeter will show full scale deflection for a current of about 1 mA.

Explanation:

l_gG = (I − l_g)S

⇒ l_g × 100 = (1 − l_g) × 0.1

⇒ l_g × 1000 = 1 − lg

⇒ 1001 l_g = 1

⇒ `I_g = 1/1001 ≈ 1  mA`