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Application: >J2 dipole. A half-wavelength antenna is made of copper wire with conductivity a = 5.7 x 107 Sim. The antenna is 3-mm thick and 1.5-m long.
(a) Calculate the impedance of the antenna and its efficiency when radiating in free space.
(h) In an attempt to reduce the impedance and increase efficiency, the antenna is made ofa copper tube, 12-mm in diameter. What is the efficiency of the antenna? Assume current flows entirely within one skin depth, on the surface of the tube.
For an ideal Zener, is the Zener voltage is 15v and the power rating is 750mW, what is the maximum zener current allowed What is the relationship between base current and collector current called
A balanced transmission line picks up an undesired signal with a 5-mW level. After conversion to an unbalanced signal using a center-tapped transformer, the undesired signal is 0.011 uW. Calculate the common mode rejection ratio (CMRR).
At t=40s, the capacitor is disconnected from the charging circuit and connected in parallel with a 5- Mega ohm resistor. Determine the voltage across the capacitor at t=40s and at t=100s.
how does your answer change if the bubble is elongated in the direction of the electric field and sphere and the dielectric shell are placed in an initially uniform electric field E 0 in the z direction.
interface binary io devices to the microcontroller. we will continue using functions to encapsulate the low level
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a road between fairbanks and nome, alaska, will have a most likely construction cost of $4 million per mile. doubling this cost is considered to have a probability of 30%, and cutting it by 25% is considered to have a probability of 10%.
1. The current in a circuit is 1 amp. What will the current be when the voltage is increased by 50% 2. A 10ohm resistor is connected across a 12 V battery. How much current is there through the resistor
A 12 V battery with a 0.3 internal resistance is to be charged froma 15 V source. If the charging current should not exceed 2 A, what is the minimum resistance of a series resistor that will limit thecurrent to this safe value
a sine wave signal (20 V PP) is connected to a 10k ohm resistor. Calculate the current through the resistor in terms of average,rms, and peak currents. what wattage rating should the resistor have
If the voltage drops by 20 % , what will be the current, assuming nothing else changes If the resistance of the device were reduced by 20 % , what current would be drawn at 240 V
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