Induction

A 25-turn circular coil of wire has diameter 1.00 m. It is placed with its axis along the direction of the Earth's magnetic field of 50.0 μT, and then in 0.200 s it is flipped 180°. An average emf of what magnitude is generated in the coil?

Conducting Rod

A conducting rod of length ℓ moves on two horizontal, frictionless rails, as shown in the attached file 'Figure P31.20'. If a constant force of 1.00 N moves the bar at 2.00 m/s through a magnetic field B that is directed into the page, (a) What is the current through the 8.00-Ω resistor R? (b) What is the rate at which energy is delivered to the resistor? (c) What is the mechanical power delivered by the force Fapp?

short answer question

Which of the following concepts applies to both sound waves and electromagnetic waves: (a) intensity? (b) polarization? Account for your answer.

short answer

Why does the peak value of the emf induced in a loop antenna depend on the frequency of the electromagnetic wave, while the peak value of the emf induced in a straight-wire antenna does not?

short answer

You are sitting upright on the beach near a lake on a sunny day, wearing Polaroid sunglasses. When you lie down on your side, facing the lake, the sunglasses don't work as well as they did while you were sitting upright. Why not?