The galvanometer records a current , Physics

A galvanometer together with an unknown resistance in series is linked across two identical batteries each of 1.5V. whenthese batteries are connected in series the galvanometer records a current of 1A and when the batteries are in parallel the current is 0.6A. The internal resistance of battery will be ?

Ans) R(net) in first case= R+2r

V=3V,

I=1=V/R=>R+2r=3.......eq(1)

R(net) in Second case= R + r/2

V=1.5V

I=V/R=>.6=3/2R+r

=> 5=2R+r..............eq(2)

Solving eq1 and eq2

we get r= 1/3 or .33 ohms. 

 

 

Posted Date: 4/5/2013 1:47:39 AM | Location : United States







Related Discussions:- The galvanometer records a current , Assignment Help, Ask Question on The galvanometer records a current , Get Answer, Expert's Help, The galvanometer records a current Discussions

Write discussion on The galvanometer records a current
Your posts are moderated
Related Questions
A coil of inductance 318.3mH and negligible resistance is linked in series with a 200 resistor to a 240V, 50Hz supply.  Calculate (a) The inductive reactance of the coil,


Mechanical energy E of particle, system or object is explained as the sum of kinetic energy K and potential energy U, i.e. E = K + U. It is a scalar quantity having dimensions [ML

Write down Gauss law in electrostatics. get its differential form in vacuum.

A bottle and marble Pour some sand into a wide mouthed bottle. Place a piece of cardboard about 5 cm square over the mouth of the bottle. Set the marble on the cardboard and th

Demonstrate the typical ultrasonic flaw detector in transmission mode? A typical ultrasonic flaw detector into its transmission mode is as demonstrated below. In this w

Similarities in Construction of MOSFET and JFET (i)  JFET is a three terminal semiconductor device (source, drain and gate) in which current conduction is by majority carriers

A 12V battery is connected in a circuit having three series-connected resistors having resistances of 4 Ω,9 Ω and 11 Ω. Verify the current flowing through and the p.d. acr

Illustrate Examples of systems out of equilibrium Examples of systems out of equilibrium: A) a stone thrown upwards that is at its highest point; B) a plane diving downwa

Explain an inertial frame of reference and derive the Lorentz transformation equations formula. How it can be used in optical gyroscope?