The radiation resistance of a small dipole current element of length l at a frequency of 3 GHz is 3 ohms. If the length is changed by 1%, then the percentage change in the radiation resistance, rounded off to two decimal places, is______________
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The
is 3 ohms. If the length is changed by 1%, then the percentage change in the radiation
resistance, rounded off to two decimal places, is______________%.
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- By measuring the currents and times and then draw the current vs time graph using the measurementat the lab for ε =8 V, R=1M Ω and C=4.7μF. What is the current at t=12 s? values obtained after the experiment:I0=8μAApproximate time until current becomes zero= 25 s2. A = area -L = length - Calculate the resisitance per unit length of a Nichrome wire of a. |=-W Radius 0.321mm. (Resistivity Nichrome= 150x10* Q.m) p = resistivity of R b. If a potential differnces of 10 V is maintained across a 1 m length of the Nichrome wire, what is the current in the wire? 4.00 kOWhat is the steady-state current I, in units of Ampere, (steady-state current= current when you wait very very long time ) through 8V battery if you replace R1 resistor by 7 Ohm, R2 resistor by 19 Ohm, ε emf by 10 V. Your result must contain two decimal places. Maximum of 4% of error is accepted in your answer.
- A capacitor with square plates, each with an area of 34.0 cm² and plate separation d = 2.44 mm, is being charged by a 525-mA current. (a) What is the change in the electric flux between the plates as a function of time? (Use the following as necessary: t. Do not use other variables, substitute numeric values. Assume that do/dt is in V m/s and t is in seconds. Do not include units in your answer. Enter the magnitude.) de dt = (b) What is the magnitude of the displacement current between the capacitor's plates?A capacitor with square plates, each with an area of 32.0 cm² and plate separation d = 2.48 mm, is being charged by a 255-mA current. (a) What is the change in the electric flux between the plates as a function of time? (Use the following as necessary: t. Do not use other variables, substitute numeric values. Assume that do/dt is in V m/s and t is in seconds. Do not include units in your answer. Enter the magnitude.) ΟΦΕ dt (b) What is the magnitude of the displacement current between the capacitor's plates? AThe prefix “mega” (M) and “kilo” (k), when referring to amounts of computer data, refer to factors of 1024 or 210 rather than 1000 for the prefix kilo, and 10242 = 220 rather than 1,000,000 for the prefix Mega (M). If a wireless (WiFi) router transfers 150 Mbps of data, how many bits per second is that in decimal arithmetic?
- sq 4. Maximum surface resistance. Consider a square sheet of side L, thickness d, and electrical resistivity p. The resistance measured between opposite edges of the sheet is called the surface resistance: R = pL/ Ld = p/d, which is independent of the area of the sheet. (R is called the resistance per square and is expected in ohms per square, because p/d has the dimensions of ohms.) If we express p by p=m/ne²t, then Rq=m/ndet. Suppose now that the minimum value of the collision time is determined by scattering from surfaces of the sheet, so that Td/v, where v is the Fermi velocity. Thus the maximum surface resistivity is Rmvp/nd²e². Show for a monatomic metal sheet one atom thickness that sq Rħ/e² = 4.1k, where lkn is 10³ ohms. sqYou plotted a graph of current vs. voltage and found the slope of the best fit line is m± Am = 4.69 ± 1.79 Amps/Volt. The resistance can be calculated from the slope by knowing: R = 1 m The fractional uncertainty in the slope is equivalent to the fractional uncertainty in the resistance: AR R = Am m Calculate the uncertainty in the resistance, AR in units of (ohms), then enter the raw value (no units) into the box below. Round to two decimal places. AR=By measuring the currents and times and then draw the current vs time graph using the measurement at the lab for ε =8 V, R=1M Ω and C=60μF. What is the current at t=50 s?
- A capacitor with square plates, each with an area of 34.0 cm2 and plate separation d = 2.64 mm, is being charged by a 215-mA current. (a) What is the change in the electric flux between the plates as a function of time? (Use the following as necessary: t. Do not use other variables, substitute numeric values. Assume that dΦE/dt is in V · m/s and t is in seconds. Do not include units in your answer. Enter the magnitude.) dΦE dt = (b) What is the magnitude of the displacement current between the capacitor's plates?A capacitor with square plates, each with an area of 37.0 cm² and plate separation d = 2.48 mm, is being charged by a 365-mA current. (a) What is the change in the electric flux between the plates as a function of time? (Use the following as necessary: t. Do not use other variables, substitute numeric values. Assume that doe/dt is in V m/s and t is in seconds. Do not include units in your answer. Enter the magnitude.) . ΟΦΕ dt = (b) What is the magnitude of the displacement current between the capacitor's plates? AA Solunoid of radius 1.50cm has 480 turns and a length of 25:0cm a) Find the rate at which current must change!! Through it. to Produce an emt of 60.0 m V₁. (Enter the magnitude), Lind dechrobe i d Note: Answer must be in A/S.