5 Questions
What is the percentage discrepancy formula for measured (M) and true (V) values?
$rac{(M-V)}{V} imes 100 ext{%}$
If you measure the radius of a wheel to be 4.16 cm, what should be the correct representation of the diameter?
8.32 cm
What are the base SI units of Coulomb's constant (k) in Coulomb's law?
$Nm^2/C^2$
Express volts (V) in terms of the base SI units.
$kg \cdot m^2 / A \cdot s^3$
What is the expression for capacitance C in terms of charge Q and potential difference V?
$C = Q/V$; x=1, y=1
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.
Test your ability to draw and measure lengths accurately without a ruler. Compare your drawn lengths to the true values using a ruler. Also, practice converting between radius and diameter measurements.
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