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Current Electricity

JEE Main 2025 (Online) 4th April Morning ShiftMCQEasy📈 Topic in 3% papers+4−1
Ques. 1JEE Main 2025, 4 April (Morning Shift)

Current passing through a wire as function of time is given as I(t) = 0.02t + 0.01 A. The charge that will flow through the wire from t = 1 s to t = 2 s is

  1. 0.02 C
  2. 0.07 C
  3. 0.06 C
  4. 0.04 C

Answer

(4) 0.04 C

Solution

I = dqdt q = 12 I dt

q = 12 (0.02t + 0.01) dt = [0.01t2 + 0.01t ]12

= 0.01(4 - 1) + 0.01(2 - 1)

= 0.03 + 0.01 = 0.04 C

Answer: (4)

Keep practising — Current Electricity

Ques. 2JEE Main 2025, 4 April (Evening Shift)

There are 'n' number of identical electric bulbs, each is designed to draw a power p independently from the mains supply. They are now joined in series across the mains supply. The total power drawn by the combination is :

  1. np
  2. p
  3. pn2
  4. pn
Ques. 3JEE Main 2025, 4 April (Evening Shift)

From the combination of resistors with resistance values R1 = R2 = R3 = 5 and R4 = 10 , which of the following combination is the best circuit to get an equivalent resistance of 6 ?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 4JEE Main 2025, 3 April (Morning Shift)

A wire of length 25 m and cross-sectional area 5 mm2 having resistivity of 2 10-6 m is bent into a complete circle. The resistance between diametrically opposite points will be

  1. 100
  2. 2.5
  3. 12.5
  4. 50
Ques. 5JEE Main 2025, 3 April (Morning Shift)

In the figure shown below, a resistance of 150.4 is connected in series to an ammeter A of resistance 240 . A shunt resistance of 10 is connected in parallel with the ammeter. The reading of the ammeter is mA. [figure]

Ques. 6JEE Main 2025, 3 April (Evening Shift)

A motor operating on 100 V draws a current of 1 A. If the efficiency of the motor is 91.6\%, then the loss of power in units of cal/s is

  1. 6.2
  2. 2
  3. 8.4
  4. 4
Ques. 7JEE Main 2025, 3 April (Evening Shift)

Two cells of emfs 1 V and 2 V and internal resistances 2 and 1 , respectively, are connected in series with an external resistance of 6 . The total current in the circuit is I1. Now the same two cells in parallel configuration are connected to same external resistance. In this case, the total current drawn is I2. The value of ( I1I2 ) is x3. The value of x is .

Ques. 8JEE Main 2025, 2 April (Morning Shift)

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
Ques. 9JEE Main 2025, 28 January (Morning Shift)

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

  1. r
  2. r6
  3. r3
  4. r9
Ques. 10JEE Main 2025, 28 January (Morning Shift)

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
Ques. 11JEE Main 2025, 28 January (Evening Shift)

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]

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