The Production and Propagation of Electromagnetic Waves (HSC SSCE Physics): Quizzes

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The Production and Propagation of Electromagnetic Waves
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What creates electromagnetic waves?

Moving or accelerating electric charges

In Coulomb's Law F=ke∣q1q2∣r2F = k_e \frac{|q_1 q_2|}{r^2}, what does rr represent?

The separation distance between charges

How is Coulomb's constant kek_e related to permittivity of free space ε0\varepsilon_0?

ke=14πε0k_e = \frac{1}{4\pi\varepsilon_0}

What creates the self-sustaining cycle in EM waves?

Changing E field makes changing B field

How are the electric field, magnetic field, and wave direction oriented in an EM wave?

All three mutually perpendicular

Do electromagnetic waves require a medium to travel through?

No, fields only need each other

At what speed do electromagnetic waves propagate through a vacuum?

c≈3.0×108c \approx 3.0 \times 10^8 m/s

What is the formula for magnetic force on a moving charged particle?

F=qvBsin⁡θF = qvB\sin\theta

When is the magnetic force on a moving charge greatest?

When B field perpendicular to motion

How do EM waves transfer energy to charged particles?

Via forces from oscillating E and B fields

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