Electrostatics & Circuits Study for Competitive Exams

Electrostatics & Circuits

Coulombs Law and Electric Field Coulombs Law and Electric Field - Capacitance and Dielectrics Coulombs Law and Electric Field - Circuit Analysis Techniques Coulombs Law and Electric Field - Electric Field Problems Coulombs Law and Electric Field - Transient Response in RC Circuits Current, Resistance and Ohms Law Current, Resistance and Ohms Law - Capacitance and Dielectrics Current, Resistance and Ohms Law - Circuit Analysis Techniques Current, Resistance and Ohms Law - Electric Field Problems Current, Resistance and Ohms Law - Transient Response in RC Circuits DC Circuits and Kirchhoffs Laws DC Circuits and Kirchhoffs Laws - Capacitance and Dielectrics DC Circuits and Kirchhoffs Laws - Circuit Analysis Techniques DC Circuits and Kirchhoffs Laws - Electric Field Problems DC Circuits and Kirchhoffs Laws - Transient Response in RC Circuits Electric Potential and Capacitance Electric Potential and Capacitance - Capacitance and Dielectrics Electric Potential and Capacitance - Circuit Analysis Techniques Electric Potential and Capacitance - Electric Field Problems Electric Potential and Capacitance - Transient Response in RC Circuits Magnetic Fields and Electromagnetic Induction Magnetic Fields and Electromagnetic Induction - Capacitance and Dielectrics Magnetic Fields and Electromagnetic Induction - Circuit Analysis Techniques Magnetic Fields and Electromagnetic Induction - Electric Field Problems Magnetic Fields and Electromagnetic Induction - Transient Response in RC Circuits

Q. What is the voltage across a 10Ω resistor if a current of 3A flows through it?

A. 30 V
B. 15 V
C. 10 V
D. 20 V

Solution

Using Ohm's law, V = I * R = 3A * 10Ω = 30 V.

Correct Answer: A — 30 V

Learn More →

Q. What is the voltage across a 10Ω resistor if the current flowing through it is 3A?

A. 30V
B. 10V
C. 15V
D. 20V

Solution

Using Ohm's law, V = I * R = 3A * 10Ω = 30V.

Correct Answer: A — 30V

Learn More →

Q. What is the voltage across a 5 Ω resistor carrying a current of 3 A?

A. 15 V
B. 10 V
C. 5 V
D. 20 V

Solution

Using Ohm's law, V = I * R = 3 A * 5 Ω = 15 V.

Correct Answer: A — 15 V

Learn More →

Q. What is the voltage across a capacitor (V) after one time constant in an RC charging circuit?

A. V = V0(1 - e^(-t/τ))
B. V = V0 * e^(-t/τ)
C. V = V0(1 + e^(-t/τ))
D. V = V0 * t/τ

Solution

The voltage across a charging capacitor after one time constant is V = V0(1 - e^(-t/τ)).

Correct Answer: A — V = V0(1 - e^(-t/τ))

Learn More →

Q. What is the voltage across a capacitor after 3 time constants if it was charged to 12 V?

A. 12 V
B. 8 V
C. 4 V
D. 0 V

Solution

After 3 time constants, a capacitor is considered fully charged, so the voltage remains at 12 V.

Correct Answer: A — 12 V

Learn More →

Q. What is the voltage across a capacitor after 3 time constants in an RC circuit with a supply voltage of 12 V?

A. 12 V
B. 8 V
C. 4 V
D. 0 V

Solution

Voltage across capacitor V(t) = V0 * (1 - e^(-t/τ)). After 3τ, V(3τ) = 12 V * (1 - e^(-3)) ≈ 12 V * (1 - 0.05) ≈ 11.4 V.

Correct Answer: B — 8 V

Learn More →

Q. What is the voltage across a capacitor after one time constant in an RC charging circuit?

A. 63.2% of the supply voltage
B. 50% of the supply voltage
C. 100% of the supply voltage
D. 36.8% of the supply voltage

Solution

After one time constant, the voltage across the capacitor reaches approximately 63.2% of the supply voltage.

Correct Answer: A — 63.2% of the supply voltage

Learn More →

Q. What is the voltage across the capacitor after one time constant in an RC charging circuit?

A. V(1 - e^(-1))
B. V(1 + e^(-1))
C. V/e
D. V

Solution

After one time constant, the voltage across the capacitor is V(1 - e^(-1)), where V is the applied voltage.

Correct Answer: A — V(1 - e^(-1))

Learn More →

Q. What is the voltage across the capacitor in an RC circuit after one time constant?

A. 0.63V
B. 0.37V
C. 1.0V
D. 0.5V

Solution

After one time constant (τ), the voltage across the capacitor reaches approximately 63% of the applied voltage V.

Correct Answer: A — 0.63V

Learn More →

Showing 271 to 279 of 279 (10 Pages)

Electrostatics & Circuits

On a scale of 0–10, how likely are you to recommend The Soulshift Academy?