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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- Question 1: By measuring the currents and times and then draw the current vs time graph using the measurement at the lab for ɛ =8 V, R=1M Q and C=1µF. What is the current at t=2.5 s? (20p) e RC = Ioe¯RC %3| R values obtained after the experiment: Io-8µA Approximate time until current becomes zero= 5.7 sBy 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 kO
- What 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? A
- The 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 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.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?