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Malus' law

I = I₀ cos²θ

Where: I = moment of inertia (kg·m²) / current (A), I₀ = I₀, θ = angle

Solved example

Given: I_0 = 7, theta = 45°
Find: I (moment of inertia (kg·m²) / current (A))

  1. Formula: I = I₀·cos(θ)²
  2. Substitute the values: I = 7·cos(45°)²
  3. Result: I = 3.5

Answer: I = 3.5

Calculator

How to calculate Malus' law

  1. Write down the formula: I = I₀ cos²θ.
  2. Note the known values (I₀, θ).
  3. Substitute them and simplify to find I.
  4. Use the calculator above to solve for any letter.

Frequently asked questions

What is the formula for Malus' law?

The formula is I = I₀ cos²θ, where I = moment of inertia (kg·m²) / current (A), I₀ = I₀, θ = angle.

What is Malus' law when I_0 = 7, theta = 45°?

I = 3.5. Substitute the values into I = I₀ cos²θ and simplify.

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