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Current Electricity

JEE Main 2024 (Online) 1st February Evening ShiftNumericalEasy📈 Topic in 12% papers+4
Ques. 1JEE Main 2024, 1 February (Evening Shift)

In an electrical circuit drawn below the amount of charge stored in the capacitor is . [figure]

Answer

60

Solution

Steady state: no current in the C–R2 branch no drop across R2

Current in the loop of cell, R1, R3: I= 104+6=1 A

C–R2 is in parallel with R3: VC=IR3=1 6=6 V

Q=CVC=10 6 V=60

Answer: 60

Keep practising — Current Electricity

Ques. 2JEE Main 2024, 31 January (Morning Shift)

Two conductors have the same resistances at 0 C but their temperature coefficients of resistance are 1 and 2. The respective temperature coefficients for their series and parallel combinations are :

  1. 1+ 2, 1 2 1+ 2
  2. 1+ 22, 1+ 22
  3. 1+ 2, 1+ 22
  4. 1+ 22, 1+ 2
Ques. 3JEE Main 2024, 31 January (Morning Shift)

Equivalent resistance of the following network is . [figure]

Ques. 4JEE Main 2024, 31 January (Evening Shift)

By what percentage will the illumination of the lamp decrease if the current drops by 20%?

  1. 26%
  2. 36%
  3. 46%
  4. 56%
Ques. 5JEE Main 2024, 31 January (Evening Shift)

The resistance per centimeter of a meter bridge wire is r, with X resistance in left gap. Balancing length from left end is at 40 cm with 25 resistance in right gap. Now the wire is replaced by another wire of 2r resistance per centimeter. The new balancing length for same settings will be at

  1. 10 cm
  2. 80 cm
  3. 40 cm
  4. 20 cm
Ques. 6JEE Main 2024, 31 January (Evening Shift)

In the following circuit, the battery has an emf of 2 V and an internal resistance of 23 . The power consumption in the entire circuit is W. [figure]

Ques. 7JEE Main 2024, 30 January (Morning Shift)

A potential divider circuit is shown in figure. The output voltage V0 is : [figure]

  1. 2 mV
  2. 4 V
  3. 0.5 V
  4. 12 mV
Ques. 8JEE Main 2024, 30 January (Morning Shift)

An electric toaster has resistance of 60 at room temperature (27 ). The toaster is connected to a 220 V supply. If the current flowing through it reaches 2.75 A, the temperature attained by toaster is around : ( if =2 10-4/ )

  1. 1235
  2. 1667
  3. 694
  4. 1694
Ques. 9JEE Main 2024, 30 January (Morning Shift)

Two cells are connected in opposition as shown. Cell E1 is of 8 V emf and 2 internal resistance; the cell E2 is of 2 V emf and 4 internal resistance. The terminal potential difference of cell E2 is V. [figure]

Ques. 10JEE Main 2024, 30 January (Evening Shift)

When a potential difference V is applied across a wire of resistance R, it dissipates energy at a rate W. If the wire is cut into two halves and these halves are connected mutually parallel across the same supply, the energy dissipation rate will become:

  1. 1/2W
  2. 4W
  3. 1/4W
  4. 2W
Ques. 11JEE Main 2024, 30 January (Evening Shift)

Two resistances of 100 and 200 are connected in series with a battery of 4 V and negligible internal resistance. A voltmeter is used to measure voltage across 100 resistance, which gives reading as 1 V. The resistance of voltmeter must be .

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