JEE Main202315 Apr 2023Morning ShiftPhysicsCurrent ElectricityActual
For designing a voltmeter of range 50 V and an ammeter of range 10 mA using a galvanometer which has a coil of resistance 54 Ω showing a full scale deflection for 1 mA as in figure. (A) for voltmeter R ≈ 50 k Ω (B) for ammeter r ≈ 0 . 2 Ω (C) for ammeter r ≈ 6 Ω (D) for voltmeter R ≈ 5 k Ω (E) for voltmeter R ≈ 500 Ω Choose the correct answer from the
Options
- AA and C
- BC and E
- CC and D
- DA and B
Correct answer
A. A and C
Step-by-step solution
The resistance is given by R = V I g - G ⇒ 50 10 - 3 - 54 ≈ 50   kΩ For ammeter, S = I g G I - I g ⇒ S = 10 - 3 × 54 ( 10 - 1 ) × 10 - 3 = 6   Ω