Physics · Magnetism and Electromagnetic Induction
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A 0.01A moving coil Galvanometer of 5 Ω resistance can be converted into a 0.2A ammeter by a resistance R with the Galvanometer when r is:
- A
0.25 Ω in parallel
- B
0.25 Ω in series
- C
0.50 Ω in parallel
- D
0.50 Ω in series
A galvanometer is converted into an ammeter by connecting a low resistance in parallel with the galvanometer. This low resistance is called shunt resistance. The formula for calculating shunt resistance is
IR = ir
0.01 x 5 = 0.2r
r = 0.25A
A galvanometer is converted into an ammeter by connecting a low resistance in parallel with the galvanometer. This low resistance is called shunt resistance. The formula for calculating shunt resistance is
IR = ir
0.01 x 5 = 0.2r
r = 0.25A
This option is incorrect as they do not appreciate that shunt resistance needs to be in parallel, not series.
'C' is incorrect as it does not give the correct value of shunt resistance.
This option is incorrect as they do not appreciate that shunt resistance needs to be in parallel, not series.
Tagged under Physics · Magnetism and Electromagnetic Induction · 2015