An electric charge responds to an electric field of strength 0.7 cos(t) V/m betw

Question

An electric charge responds to an electric field of strength 0.7 cos(t) V/m between the poles of an electromagnet, where t stands for time in seconds. How as a function of time, is the magnetic field varying? The magnetic field variations can be assumed to induce the entire electric field at this location. If the radius of the electromagnet is R express your answer in terms of R. (0.70/R) sin (t) T (0.70R^2) cos(t) T (1.4/R) sin(t) T (1.4/R^2) sin(t) T (1.4/R) cos(t) T The kinetic energy of an object moving at 10% the speed of light is exactly equal to (1/2) m v^2 slightly higher than that given by (1/2) m v^2 slightly less than that given by (1/2) m v^2 A metal wire is bent into a square and carries a uniform current throughout it. The net magnetic field the center square is zero. True False An AM radio station is assigned a frequency range from to 930 kHz to 940 kHz. A tuner in the form of an RLC circuit in a radio receiver resonates in the middle of this frequency range. The circuit uses a 33 pF capacitor. In order to function properly, the current through the frequency range must be at least 50% of the current a resonance. What is the maximum possible value of the RLC circuit's resistance? 26 Ohm 60 Ohm 37 Ohm 72 Ohm 49 Ohm

Explanation / Answer

6- always equal to 1/2 mv^2.

7-False..(can not be zero because by right hand rule every side produce magnetic field in the same direction hence net magnetic field can not be zero.)

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