Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET2016PhysicsCurrent ElectricityActual

A voltmeter of resistance 20000 reads 5 volt. To make it read 20 volt, the extra resistance required is

Options

  1. A40000 in parallel
  2. B60000 in parallel
  3. C60000 in series
  4. D40000 in series

Correct answer

C. 60000 in series

Step-by-step solution

For a voltmeter, in which current I_g passes, where G= resistance of voltmeter =20000 From (i) and (ii) 5 20 = G G+R or 1 4 = G G+R or R=3 G=3 20000=60000 or extra resistance =60000 in series

Practice Current Electricity on Quantrex Academy →

More from Current Electricity

A potentiometer wire of 400 cm length has a resistance of 20 . It is connected in series with a resistance of 15 and a accumulator of EMF 6 V (negligible internal resistance). The 2026In the following figure current I equal to 2026The range of voltmeter is 10 V and its resistance is 50 . To convert it to a voltmeter of range 15 V , how much resistance is to be added? 2026When a galvanometer is shunted with a 2 resistance, the deflection is reduced to one-fourth. If the galvanometer is further shunted with a 1 resistance, the further reduction in de 2026A galvanometer can be converted into a voltmeter of certain range by connecting a resistance of 990 in series with it. When the resistance of 480 is connected in series, the range 2026A resistance is to be measured using a meter bridge; the student chooses the standard resistance R to be 100 . The student finds the null point at l₁=16 cm. To get the null point n 2026Which of the following statements is FALSE? A. In a balanced Wheatstone bridge, if the cell and the galvanometer are exchanged, the null point is disturbed. B. A rheostat can be us 2026A potentiometer wire has length 4 m and resistance 8 . The resistance that must be connected in series with the wire and the driving battery of e.m.f. 2 V, so as to get a potential 2026 Full Current Electricity list All NEET PYQs