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JEE Advanced Current Electricity — practice questions

Explore 70 free Current Electricity questions in JEE Advanced Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Current Electricity questions and exercises with answers

Showing questions 1–30 of 70.

The SI unit of electric current is:Read the answer and worked solution →The current I is related to charge q and time t by:Read the answer and worked solution →Electric current is a:Read the answer and worked solution →Ohm's law states V = ___ ?Read the answer and worked solution →The SI unit of resistance is:Read the answer and worked solution →For resistors in series, the equivalent resistance is:Read the answer and worked solution →For resistors in PARALLEL, the equivalent resistance is given by:Read the answer and worked solution →Kirchhoff's Current Law (KCL) is based on conservation of:Read the answer and worked solution →Kirchhoff's Voltage Law (KVL) is based on conservation of:Read the answer and worked solution →A galvanometer can be CONVERTED to an ammeter by:Read the answer and worked solution →Find the equivalent resistance of 2 Ω and 3 Ω connected in SERIES:Read the answer and worked solution →Find the equivalent resistance of 6 Ω and 3 Ω in PARALLEL:Read the answer and worked solution →A battery with emf 12 V and internal resistance 1 Ω drives 2 A current. Find terminal voltage V:Read the answer and worked solution →Resistance R of a conductor is proportional to:Read the answer and worked solution →Two resistors 4 Ω and 12 Ω are in parallel; this combination is in series with 8 Ω. Total resistance:Read the answer and worked solution →Drift velocity v_d is given by:Read the answer and worked solution →In a Wheatstone bridge, BALANCE condition gives:Read the answer and worked solution →A 2 Ω, 4 Ω and 6 Ω resistor are in parallel. Equivalent resistance:Read the answer and worked solution →To convert a galvanometer to a VOLTMETER, connect:Read the answer and worked solution →Three cells of emf 2 V each, internal resistance 0.5 Ω each, are connected in series. Total emf and internal resistance:Read the answer and worked solution →Three identical cells with emf 1.5V and internal resistance 0.6 Ω each are connected in parallel. Find equivalent emf and internal resistance:Read the answer and worked solution →If a wire of resistance R is cut into 4 equal parts and joined in parallel, the new resistance is:Read the answer and worked solution →A potentiometer is a NULL device used to:Read the answer and worked solution →A 10 V battery is connected across a 5 Ω resistor. The current through the resistor is:Read the answer and worked solution →Specific resistivity (ρ) of a conductor depends mainly on:Read the answer and worked solution →An ammeter has 0.1 Ω resistance and 1 mA full-scale current. The shunt needed to extend range to 1 A:Read the answer and worked solution →In a Wheatstone bridge: P = 4Ω, Q = 8Ω, R = 6Ω. For balance, S =Read the answer and worked solution →Five identical bulbs are connected in series across an emf of 100V. Each bulb has resistance 5 Ω. Find total current:Read the answer and worked solution →A 12V battery (internal r = 0.5 Ω) drives current through 5.5 Ω external load. Find power dissipated in EXTERNAL resistor:Read the answer and worked solution →A copper wire of length 1 m and cross-section 1 mm² has resistivity 1.7 × 10⁻⁸ Ω·m. Its resistance is:Read the answer and worked solution →

Worked practice questions

The SI unit of electric current is:

  1. ohm
  2. volt
  3. coulomb
  4. ampere
Show answer and solution

Correct answer: D. ampere

Electric current = rate of flow of charge. **SI unit:** ampere (A) = coulomb/second. Volt is for potential difference, coulomb for charge, ohm for resistance.

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The current I is related to charge q and time t by:

  1. I = q/t (rate of charge flow)
  2. I = q − t
  3. I = q + t
  4. I = q × t
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Correct answer: A. I = q/t (rate of charge flow)

I = dq/dt — current is the rate of flow of charge. In steady state, I = q/t.

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Electric current is a:

  1. Vector quantity
  2. Neither
  3. Scalar quantity
  4. Both
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Correct answer: C. Scalar quantity

Although current has direction in a circuit, it doesn't follow vector addition laws (currents don't add vectorially at junctions but algebraically). **Hence treated as scalar.**

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