Free Current Electricity MCQs with Answers
1,052 Current Electricity MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
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1,052 questions · page 41 of 53
- A. 7.4 N, + x direction
- B. 0.6 N, + x direction
- C. 0.6 N, - x direction
- D. 7.4 N, - x direction
Explanation: To determine the resultant force on the center charge, we need to consider the vector sum of the forces acting on it.
Correct answer: 0.6 N, + x direction- A. 36O±5 Ω
- B. 970 ± 59 Ω
- C. 1500±5 Ω
- D. 2800 ± 5 Ω
Explanation: The color bands on a resistor are interpreted as follows:The first band (Brown) represents the first significant digit, which is 1.The…
Correct answer: 1500±5 Ω- A. I2 is smaller than I3 and I1
- B. I3 is smaller than I2 and I1
- C. I2 is smaller than I1 but bigger than I3
- D. I2 is smaller than I3 but bigger than I1
Explanation: Option A is wrong because I1 is the total current so cannot be smaller than I2 or I3.Option B is incorrect because it shows that I2 is…
Correct answer: I2 is smaller than I1 but bigger than I3- A. 0
- B. 1/2
- C. 2
- D. 3/2
Explanation: When a wire is molded in the form of a ring and carries a charge q, the electric field created by the ring at any point on its axis is…
Correct answer: 0- A. When 1 A current is passed through a 3 ohm resistor for 2 sec
- B. When 1 A current is passed through a 2 ohm resistor for 3 sec
- C. When 2 A current is passed through a 1-ohm resistor for 2 sec
- D. When 3 A current is passed through a 1-ohm resistor for 1 sec
Explanation: To determine the largest heating effect in joules, we need to calculate the heat produced in each scenario using the formula: Heat (H) =…
Correct answer: When 3 A current is passed through a 1-ohm resistor for 1 sec- A. 600 J
- B. 1.2 x 10^3 J
- C. Depends on for how much time it is used
- D. 3.6 x 10^4 J
Explanation: To calculate the total energy stored in the 12V-50 Ampere-hour battery, we need to find the total charge (in Coulombs) stored in the…
Correct answer: 1.2 x 10^3 J- A. 6.5 ohm
- B. 5 ohm
- C. 3 ohm
- D. 4 ohm
Explanation: The explanation for this question is as follows:
Correct answer: 3 ohm- A. Ω-m2
- B. (Ω-m)-3
- C. Ω-m
- D. (Ω-m)-1
Explanation: Resistivity (ρ) is a measure of how strongly a material opposes the flow of electric current.
Correct answer: Ω-m- A. 0.1 m s-1
- B. 1 ms 1
- C. 10 ms -1
- D. 1000 km s -1
Explanation: The correct answer is a) 0.1 m/s. This value is more representative of a typical drift velocity for charged particles in a conductor under…
Correct answer: 0.1 m s-1- A. 5
- B. 12
- C. 1/12
- D. 300
Explanation: Q=I × tQ=5×60=300Hence, option C is the correct choice.
Correct answer: 300- A. 10 V
- B. 30 V
- C. 40 V
- D. 50 V
- E. 70 V
Explanation: -Current through the circuit I= E/R+r I= 40/15+5=2A-Voltage drop across R V=IR=2×15=30 V
Correct answer: 30 V- A. Circuit is closed
- B. Current is maximum
- C. Circuit is open
- D. All of these
Explanation: Electromotive force (EMF) is equal to the terminal potential difference when no current flows and In the open circuit the current can not…
Correct answer: Circuit is open- A. Non-linear
- B. Varying
- C. Linear
- D. None of these options are correct
Explanation: Ohm's law defines the relationship between the voltage, current, and resistance in an electric circuit: I = V/R.
Correct answer: Linear- A. Barometer
- B. Manometer
- C. Galvanometer
- D. Voltmeter
Explanation: A voltmeter is an instrument used for measuring the electrical potential difference between two points in an electric circuit.
Correct answer: Voltmeter- A. Ampere
- B. Volt
- C. Joules
- D. Watt
Explanation: This the standard answer. SI unit of Current is Ampere. The SI unit of Energy is Joules, The SI unit of Power is Watt The SI unit of…
Correct answer: Ampere- A. 1500 Coulomb
- B. 150 Coulomb
- C. 13400 Coulomb
- D. 140 Coulomb
Explanation: Charge = Current x time Charge = 10 x 15 Charge = 150 C
Correct answer: 150 Coulomb817. P.D stands for:
- A. Potential difference
- B. Potential deviation
- C. Power difference
- D. Power dissipated
Explanation: Potential difference is the difference in the amount of energy that charge carriers have between two points in a circuit.
Correct answer: Potential difference- A. Horse power
- B. Kilowatt
- C. kWh
- D. Nm/s
Explanation: Kilowatt-hours, abbreviated as KWh, is a unit of energy representing one thousand watt-hours.And it is not a unit of power.The rest are…
Correct answer: kWh- A. 1200 Coulombs
- B. 600 Coulombs
- C. 500 Coulombs
- D. 20 Coulombs
Explanation: Current I = 2 ATime T = 10 minutes = 600 secCharge Q = ??SOLUTION : I= Q/TQ = ITQ = 600×2 Q = 1200 coulomb
Correct answer: 1200 Coulombs- A. Product of the reciprocals of the individual resistances
- B. Sum of the reciprocals of the individual resistances
- C. Product of the individual resistances
- D. Sum of the individual resistances
Explanation: Resistors are said to be in series when equal current flows through each resistor because there is only one path for the charges to flow…
Correct answer: Sum of the individual resistances