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Current Electricity question

2013 · Shift 0 · Q61
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Current Electricity question

2013 · Shift 0 · Q61

JEE MainPhysicsCurrent ElectricityMCQ+4 / −1
This questions has Statement - I{\rm I}I and Statement -II{\rm I}{\rm I}II. Of the four choices given after the Statements, choose the one that best describes into two Statements. Statement - I{\rm I}I: Higher the range, greater is the resistance of ammeter. Statement -II{\rm I}{\rm I}II : To increase the range of ammeter, additional shunt needs to be used across it.
  1. A
    Statement - I{\rm I}I is true, Statement -II{\rm II}II is true, Statement -II{\rm II}II is the correct explanation of statement -I{\rm I}I.
  2. B
    Statement - I{\rm I}I is true, Statement -II{\rm II}II is true, Statement -II{\rm II}II is not the correct explanation of statement -I{\rm I}I.
  3. C
    Statement - I{\rm I}I is true, Statement -II{\rm II}II is false
  4. D
    Statement - I{\rm I}I is false, Statement -II{\rm II}II is true
View written solutionFree

Correct answer: D

  1. Recall the principle of an ammeter

    An ammeter is connected in series, so its resistance should be very small.

    To convert a galvanometer into an ammeter of larger range, a small shunt resistance is connected in parallel with it so that most of the current bypasses the meter.

  2. Analyze Statement I

    Statement I says: Higher the range, greater is the resistance of ammeter.

    This is false.

    For an ammeter of higher range, we use a smaller shunt resistance in parallel, so the effective resistance of the ammeter decreases, not increases.

    Hence, Statement I is false.

  3. Analyze Statement II

    Statement II says: To increase the range of ammeter, additional shunt needs to be used across it.

    This is true.

    If the range is to be increased, more current must bypass the meter movement, which is done by using a shunt across the ammeter/galvanometer.

    Hence, Statement II is true.

  4. Choose the correct option

    • Statement I: False
    • Statement II: True

    Therefore, the correct option is:

    D\boxed{\text{D}}D​

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