SSC JE Electrical Engineering 2017 Set 3 Paper

Question : 142 of 200

Marks: +1, -0

A 35V-source is connected to a series circuit at 600 ohms and R as shown. If a voltmeter at internal resistance 1.2 kilo ohms is connected across 600 ohm resistor it reads 5V. The value of R is___

1.2 kΩ
2.4 kΩ
3.6 kΩ
7.2 kΩ

Validate

Solution:

Voltmeter has internal resistance 1.2 kΩ and Read 5V.

R_\eq={600 ×1200}/{1200+ 600}=400Ω

I =5/400A

→ current flow in the circuit

V _R=35-(5/400×400)

Voltage across resistance (

V_R

)

V_R=30V

∴

R=V_R/I=30/5×400=2.4

kΩ

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