Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET2026PhysicsCurrent ElectricityActual

A uniform metallic wire having resistance 4 is bent to form a square loop (ABCD) (see figure). A resistance of 2 is connected between points B and D and a battery of 2 V is connected across points A and C as shown in the figure. Now the value of current ( I ) is :

Options

  1. A2 A
  2. B8 A
  3. C4.5 A
  4. D4 A

Correct answer

A. 2 A

Step-by-step solution

The total resistance of the uniform wire is 4 . Since it is bent to form a square loop ABCD, the resistance of each of its four sides is equal. Resistance of each side = 4 4 = 1 . Thus, R_ AB = R_ BC = R_ CD = R_ DA = 1 . The given circuit can be redrawn as a Wheatstone bridge where the arms are AB, BC, AD, and DC, and the central arm is BD. The battery is connected across the opposite corners A and C. Let's check the balance condition of the Wheatstone bridge: R_ AB R_ AD = 1 1 = 1 R_ BC R_ DC = 1 1 = 1 Since R_ A

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