What shunt resistance must be connected across a galvanometer of 50.0Q resistance Which gives full-scale deflection with 2.0 mA current, to convert it into an ammeter of range 10.0 A?
Correct answer: B. 0.01 Ω
- A. 105 Ω
- B. 0.01 Ω
- C. 2.5 Ω
- D. 3.9 Ω
- E. 4.7 Ω
Explanation
To convert a galvanometer to an ammeter with a specific range, a shunt resistor (Rs) is placed in parallel with the galvanometer. The formula to calculate the necessary shunt resistance is Rs = (Ig * Rg) / (I - Ig), where Ig is the galvanometer current (2.0 mA), Rg is the galvanometer resistance (50.0 Ω), and I is the desired full-scale current (10.0 A). Substituting these values gives Rs = (0.002 A * 50.0 Ω) / (10.0 A - 0.002 A) = 0.01 Ω.Option B is correct as it matches the calculated value. The other options, A, C, D, and E, are incorrect because they do not align with the calculated shunt resistance required for 10.0 A full-scale deflection.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Current Electricity
Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
Practise Current Electricity
1,052 free Current Electricity MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Current Electricity questions
A platinum wire has a resistance of 10 Ω at 0°C and 20 Ω at 273°C. What is the value of the temperature coefficient of resistance of platinum?
The potential difference between the terminals of a battery in an open circuit is 2.2V. When it is connected across a resistance of 5.0 ohms, the potential falls to 1.8V. What is the current of the battery?
What resistance must be connected across a galvanometer of 50.0 ohm resistance which gives full scale deflection with 2.0mA current to convert it into an ammeter of range 10.0A?
What is the energy of a photon in a beam of infrared radiation of wavelength 1240nm?
The magnitudes of forces on the centre charge due to left and right charges are 3.4 N and 4.0 N respectively. What will be the resultant force on the centre charge?
In the given figure, the value of the electric field between the plates is: