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Questions and Answers
What is the percentage discrepancy formula for measured (M) and true (V) values?
What is the percentage discrepancy formula for measured (M) and true (V) values?
- $rac{(V-M)}{V} imes 100 ext{%}$
- $rac{(M-V)}{V} imes 100 ext{%}$ (correct)
- $rac{(V-M)}{M} imes 100 ext{%}$
- $rac{(M-V)}{M} imes 100 ext{%}$
If you measure the radius of a wheel to be 4.16 cm, what should be the correct representation of the diameter?
If you measure the radius of a wheel to be 4.16 cm, what should be the correct representation of the diameter?
- 8.32 cm (correct)
- 4.16 cm
- 8 cm
- 4.08 cm
What are the base SI units of Coulomb's constant (k) in Coulomb's law?
What are the base SI units of Coulomb's constant (k) in Coulomb's law?
- $C/Nm^2$
- $N/C^2$
- $Nm^2/C^2$ (correct)
- $C^2/Nm^2$
Express volts (V) in terms of the base SI units.
Express volts (V) in terms of the base SI units.
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What is the expression for capacitance C in terms of charge Q and potential difference V?
What is the expression for capacitance C in terms of charge Q and potential difference V?
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Study Notes
Formulae and Units
- The percentage discrepancy formula is ((M - V) / V) × 100, where M is the measured value and V is the true value.
Representation of Measurements
- When measuring the radius of a wheel, the correct representation of the diameter is 2 × (measured radius) = 2 × 4.16 cm = 8.32 cm.
Coulomb's Law
- The base SI units of Coulomb's constant (k) are N m² C⁻².
Electric Units
- Volts (V) can be expressed in terms of base SI units as kg m² s⁻³ A⁻¹.
Capacitance
- Capacitance (C) is expressed in terms of charge (Q) and potential difference (V) as C = Q / V.
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