Home
Class 12
PHYSICS
A voltmeter with resistance 2500 Omega i...

A voltmeter with resistance `2500 Omega` indicates a voltage of `125 V` in the circuit shown in figure. What is the series resistance to be connected ot voltmeter so that it indicates `100 V`? Consider ideal battery.

A

`625 Omega`

B

`120 Omega`

C

`550 Omega`

D

Data insufficient

Text Solution

Verified by Experts

The correct Answer is:
A
a. `R_0= 2500 Omega`
`E = 125 V`
When r is connected in series,
`i = E/(R_0 +r)`
Reading in voltmeter = `E - ir = 100`
`100 = 125 - (125)/(2500 +r) xx r`
or `r = 625 Omega`.
Promotional Banner

Similar Questions

Explore conceptually related problems

A voltmeter with a resistance 50 xx 10^(3) Omega is used to measure voltage in a circuit. To increase its range to 3 times, the additional resistance to be put in series is

In the circuit figure, the voltmeter reads 30 V. The resistance of the voltmeter is

What is the resistance of voltmeter shown in the circuit ?

A voltmeter of resistances 400(Omega) is used to measure the potential difference across the 100(Omega) resistor in the circuit shown in figure.(a) What will be the reading of the voltmeter ?(b) What was the potential difference across 100(Omega) before the voltmeter was connected ?

The voltmeter shown in the figure reads 10V across 40 omega . The resistance of voltmeter is

A battery of emf 2 V and initial resistance 1 Omega is connected across terminals A and B of the circuit shown in figure .

A voltmeter has resistance 2000 Omega and range 5 V. For increasing its range upto 20V, a resistance of

in the circuit shown in the figure, each battery is of 5 V and has an internal resistance of 0.2 Omega What is the reading of the ideal voltmeter V

In the given circuit, the voltmeter records 5 V. The resistance of the voltmeter in Omega is

The voltmeter shown in figure reads 18V across the 50(Omega) resistor. Find the resistance of the voltmeter.