Now Ishani and John are ready to use what they know to build the turn indicator. They decide that the signal in their cars goes about once per second. Assuming that they set the trigger to make the indicator go when charge has reached 1 − 1/e of its final value, and that it takes about the same amount of time to discharge as to charge, suggest values for R and C that could be used. (Assume that the capacitor reaches approximately its maximum value, discharges to 1 − 1/e of its maximum value over the course of 1 second, and then begins charging again.)'

For a resistance (R) of 1000 MΩ and capacitance (C) of 2.179x10⁻³μF

Explanation:

The charge on the discharging capacitor is equal:

If t = 1 s, then:

Matching both equations:

If t = 1

The capacitance for a resistor of resistance of 1000 MΩ is equal:

260 miles per hour

explanation:

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia