In the given figure an ammeter A consists of a $240 \Omega$ coil connected in parallel to a $10 \Omega$ shunt. The reading of the ammeter is ______ mA.

JEE Main · 2024 · 06 Apr 2024 · Shift 2 · Current Electricity

In the given figure an ammeter A consists of a

240Ω

coil connected in parallel to a

10Ω

shunt. The reading of the ammeter is ______ mA.

Answer: 160

The ammeter's coil (

240 Ω

) and shunt (

10 Ω

) are in parallel:

R_{e q} = \frac{240 \times 10}{250} = 9.6 Ω

. In series with

140.4 Ω

and a 24 V source, total resistance

= 140.4 + 9.6 = 150 Ω

. The current the ammeter reads is

I = \frac{24}{150} = 0.16 A = 160 mA

JEE Main · 2024 · 06 Apr 2024 · Shift 2 · Integer answer