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Current Electricity · Question 35

JEE Main 2025 (Online) 2nd April Morning ShiftMCQEasy📈 Topic in 19% papers+4−1
1

The battery of a mobile phone is rated as 4.2 V, 5800 mAh. How much energy is stored in it when fully charged?

  1. 87.7 kJ
  2. 43.8 kJ
  3. 48.7 kJ
  4. 24.4 kJ

Answer

(1) 87.7 kJ

Solution

Charge: Q = 5800 mAh = 5.8 A 3600 s = 20880 C

Energy: E = QV = 20880 4.2

= 87696 J 87.7 kJ

Answer: (1)

JEE Main 2025 (Online) 2nd April Morning Shift

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2

Find the equivalent resistance between two ends of the following circuit [figure]

  1. r
  2. r6
  3. r3
  4. r9
JEE Main 2025 (Online) 28th January Morning Shift
3

A wire of resistance R is bent into an equilateral triangle and an identical wire is bent into a square. The ratio of resistance between the two end points of an edge of the triangle to that of the square is

  1. 8/9
  2. 9/8
  3. 32/27
  4. 27/32
JEE Main 2025 (Online) 28th January Morning Shift
4

The value of current I in the electrical circuit as given below, when potential at A is equal to the potential at B, will be A. [figure]

JEE Main 2025 (Online) 28th January Evening Shift

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