Electrical Resistance and Resistivity Calculation

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According to Ohm's law, what is the relationship between the potential difference (V) and the current (I) in a conductor?

V is inversely proportional to I
V is independent of I
V is exponentially related to I
V is directly proportional to I (correct)

What is the formula that describes the relationship between the resistance (R), the length (L), the cross-sectional area (A), and the resistivity (ρ) of a conductor?

$R = \frac{L}{\rho A}$
$R = \frac{\rho L}{A}$ (correct)
$R = \frac{A}{\rho L}$
$R = \rho LA$

How does the resistance of a conductor change with temperature, according to the given information?

Resistance changes exponentially with temperature
Resistance decreases linearly with temperature
Resistance is independent of temperature
Resistance increases linearly with temperature (correct)

What is the definition of the term 'current density' as mentioned in the text?

The uniform distribution of current in any cross-section of the conductor (B) Signup and view all the answers

According to the given information, what is the relationship between the potential difference (V) and the electric field (E) in a conductor?

$V = EL$ (D) Signup and view all the answers

What is the relationship between the potential difference (V), the current (I), and the resistance (R) of a conductor, as described by Ohm's law?

$V = IR$ (B) Signup and view all the answers

What is the unit of electric current?

Ampere (B) Signup and view all the answers

What is the relationship between drift velocity and electric field in a conductor?

Drift velocity is directly proportional to the electric field (A) Signup and view all the answers

Which of the following is the correct statement about the electric field within a conductor?

The electric field is zero everywhere within the conductor (B) Signup and view all the answers

Which of the following is the correct relationship between the resistivity of a conductor and its conductivity?

Resistivity and conductivity are inversely proportional (C) Signup and view all the answers

According to Ohm's law, what is the relationship between voltage, current, and resistance?

Voltage is directly proportional to current and resistance (B) Signup and view all the answers

What is the relationship between resistivity, resistance, cross-sectional area, and length of a material?

Resistivity = Resistance / (Cross-sectional area × Length) (C) Signup and view all the answers

How does the resistance of a material change with temperature?

Resistance changes with temperature according to the equation: ΔR = R × α × ΔT (C) Signup and view all the answers

Which of the following materials has the highest conductivity?

Silver (B) Signup and view all the answers

What is the primary function of a resistor in an electric circuit?

To limit the current flow in the circuit (B) Signup and view all the answers

If the temperature of a copper wire increases, what happens to its resistance?

Resistance increases (B) Signup and view all the answers

What is the relationship between conductivity and resistivity of a material?

Conductivity is inversely proportional to resistivity (C) Signup and view all the answers

Electrical Resistance and Resistivity Calculation

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