For what the parabolic dishes are used?
Answer / Aditi Sharma
Parabolic dishes, or reflectors, are used for collecting and focusing electromagnetic waves such as radio waves, microwaves, and light. They have applications in satellite dishes, radar systems, telescopes, and other directional antennas.
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A coil consisting of 200 turns of wire has its ends connected to a circuit such that the total resistance of the coil and the circuit is 2.0 ohm. There is no source of e.m.f. in the circuit. Each turn of the coil is a square of side 18 cm, and a uniform magnetic field directed perpendicular to the plane of the coil is turned on. If the field changes linearly from 0 to 0.5 T in 0.8 s, what is the magnitude of the current in the coil while the field is changing?
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