Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET2014PhysicsCurrent ElectricityActual

Two cities are 150   k m apart. Electric power is sent from one city to another city through copper wires. The fall of potential per k m is 8 volts and the average resistance per k m is 0.5   Ω . The power loss in the wire is:

Options

  1. A19.2 W
  2. B19.2 k W
  3. C19.2 J
  4. D12.2 k W

Correct answer

B. 19.2 k W

Step-by-step solution

Distance between the two cities, 150   km . Voltage drop per kilometre is 8   V   km - 1 . Resistance per kilometre 0 . 5   Ω   km - 1 Total voltage drop will be, V d r o p = 150   km × 8   V   km - 1 = 1200   V Total resistance of wire, R = 0.5   Ω   km - 1 × 150   km = 75   Ω Therefore, the power loss will be, P = V 2 R = 150 × 8 2 0.5 × 150 = 19.2   kW

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