Non-ideal case!!!

Electricity and Magnetism Level 3

What is the Ammeter reading (in amperes)?

Given -

  • Area of cross section of wire = 3 c m 2 3cm^2

  • Resistance across AB (Internal Resistance of battery ) = 20 Ω 20 \Omega

  • Resistance of ammeter = 5 Ω 5 \Omega

  • E.M.F. of battery = 500 V 500V


The answer is 10.00.

Aryan Sanghi by Aryan Sanghi , 17, India

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1 solution

Steven Chase
Feb 20, 2017

There are six segments. Use the formula R = ρ L A R = \frac{\rho L}{A} . Then add 35 Ω 35 \Omega of additional resistance for a total of 50 Ω 50 \Omega . The current through the ammeter is 500 V 50 Ω = 10 A \frac{500V}{50 \Omega} = 10 A . I used a spreadsheet to do the calculations.

0 Helpful 0 Interesting 0 Brilliant 0 Confused

This is a straightforward question in which all the resistors are in series. We will have to calculate the resistance of all the wires and then use the ohms law.

Rohit Gupta - 4 years, 3 months ago

Thanks for posting a solution sir.

Aryan Sanghi - 4 years, 3 months ago

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