Q49.An ammeter reads up to 1 ampere. Its internal resistance is 0.81ohm. To increase the range to 10 A the value of the required shunt is (1) 0.03Ω (2) 0.3Ω (3) 0.9Ω (4) 0.09Ω
What This Question Tests
This question tests the ability to calculate the required shunt resistance to extend the range of an ammeter, applying the principles of parallel circuits and current division.
Concepts Tested
Formulas Used
S = (I_g * R_g) / (I - I_g)
📚 NCERT Sections This Tests
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3.1 The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4 Ω, what is the maximum current that can be drawn from the battery?
4.10 — Two Moving Coil Meters, M1 And M2 Have The Following Particulars:
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4.10 Two moving coil meters, M1 and M2 have the following particulars: R1 = 10 Ω, N1 = 30, A1 = 3.6 × 10–3 m2, B1 = 0.25 T R2 = 14 Ω, N2 = 42, A2 = 1.8 × 10–3 m2, B2 = 0.50 T (The spring constants are identical for the two meters). Determine the ratio of (a) current sensitivity and (b) voltage sensitivity of M2 and M1.
📋 Question Details
- Chapter
- Current Electricity
- Topic
- Ammeter, Shunt Resistance
- Year
- 2003
- Shift
- Unknown
- Q Number
- Q49
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 3: Current Electricity
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