Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main2017PhysicsCurrent ElectricityActual

Which of the following statements is false?

Options

  1. AKirchhoff's second law represents energy conservation
  2. BWheatstone bridge is the most sensitive when all the four resistances are of the same order of magnitude
  3. CIn a balanced Wheatstone bridge if the cell and the galvanometer are exchanged, the null point is disturbed
  4. DA rheostat can be used as a potential divider

Correct answer

C. In a balanced Wheatstone bridge if the cell and the galvanometer are exchanged, the null point is disturbed

Step-by-step solution

Let us assume R 1 ,   R 2 ,   R 3   &   R 4 is connected balanced wheat stone bridge, such that R 1 R 3 = R 2 R 4     . . . 1 as shown below, If galvanometer and cell is exchanged, then circuit becomes as shown in below figure, The circuit is redrawn and can be visualised as below figure, In this case, if it is balanced, then there must be, R 1 R 2 = R 3 R 4     . . . 2 Equation 1   &   2 realises that, both equations are same, which means null point is not

Practice Current Electricity on Quantrex Academy →

More from Current Electricity

A metal wire of cross-sectional area 0.5 mm ^2 and length 100 m is connected across a battery of e.m.f. 2 V and internal resistance 1 . The density, atomic mass and electrical cond 2026As shown in the figure, the resistance of a galvanometer G can be found by the half-deflection method. Here the resistance R₂ is adjusted such that when the key K is closed the def 2026The stored charge in the capacitor in steady state of the following circuit is ________ C. 2026A moving coil of galvanometer when shunted with 2 , resistance gives a full scale deflection for a current of 500 mA. When a resistance of 470 , is connected in series it gives a f 2026Two cells of emfs 1 V and 2 V and internal resistance 2 , and 1 , , respectively connected in parallel, gave a current of 1 A through an external resistance. If the polarity of one 2026Refer to the circuit diagram given below. The heat generated across the 6 , resistance in 100 second is 100 J. The value of is _______. (Nearest integer) 2026In an experiment to determine the resistance of a given wire using Ohm's law, the voltmeter and ammeter readings are noted as 10 V and 5 A , respectively. The least counts of voltm 2026Under steady state condition the potential difference across the capacitor in the circuit is _______ V. 2026 Full Current Electricity list All JEE Main PYQs