Electromagnetism Quiz True or False

1. The electric field E of a conducting sphere with radius R at a distance of r < R is: -> Zero
2. At what angle would we position an electric field relative to a surface to minimize the electric flux? -> 180°
3. Unfortunately, while embarking on another research adventure, Dr. Livingston’s plane crashes in the Andes mountains. Because he was studying this module on the way over, the rest of the crew officially designated him to be the radio guy. His task consists of transmitting SOS to civilization and calling for help. In order to do this, he must first build an LC circuit with a resonant frequency of 320 Hz. The tools at his disposal are batteries worth 300 V of power supply, two resistors of 35 Ω and 55 Ω each, an inductor of 10 mH and two capacitors of 25 μF and 55 μF. Which tools does he use to assemble the circuit? -> 300 V batteries, no resistor, the 25 μF capacitor and the inductor of 10 mH
4. To correctly build a critically damped circuit, you must: -> Set V to zero
5. The electric portion of an electromagnetic wave traveling in vacuum can be written as Ex = 50 cos(2π × 10-15 t – 2πx) with Ez = Ey = 0. What is the direction of propagation of the wave? -> y direction
6. Why is there no magnetic flux for a closed surface? -> Because magnetic monopoles do not exist
7. Which configuration has a uniform electric field? : -> Two parallel charged plates and an infinite charged sheet
8. We close the switch of an LC circuit. When the current reaches its maximum, what is the value of electric energy stored in the capacitor? -> The electric energy is zero.
9. A current loop in a magnetic field experiences a torque given by: -> τ = E × B
10. Why do two parallel wires with currents attract or repel each other?: -> Coulomb’s Law

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