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- Taking R = 1.00 k and = 250 V in Figure P21.49, determine the direction and magnitude of the current in the horizontal wire between a and e. Figure P21.49arrow_forwardA length of metal wire has a radius of 5.00 × 10−3 m and a resistance of 0.100 Ω. When the potential difference across the wire is 15.0 V, the electron drift speed is found to be 3.17 × 10−4 m/s. On the basis of these data, calculate the density of free electrons in the wire.arrow_forwardA wire 3.77 m long and 6.81 mm in diameter has a resistance of 20.6 mΩ. A potential difference of 26.6 V is applied between the ends. What is the magnitude of the current density? Current in the wire is 1291.26 A Answer isnt 11284400, 3547400000,arrow_forward
- when a potential difference of 10.0V is placed across a certain soild cylindrical resistor, the current through it is 2.0A. If the diameter of this resistor is now doubled, the current will be?2.0A18.0A8.0A3.0Aarrow_forwardThe density and resistivity of a cubic metal of mass m=81 g are d=3 g/cm3 and ρ=1.5 x 10-8 Ω m, respectively. When a potential difference of ∆V=5x10-5 V is applied on two opposite faces of the cube, what is the current (A) passing through the surfaces ?arrow_forwardA copper wire has a circular cross section with a radius of 1.06 mm. (a) If the wire carries a current of 3.38 A, find the drift speed (in m/s) of electrons in the wire. (Take the density of mobile charge carriers in copper to be n = 1.10 ✕ 1029 electrons/m3.) ???m/s (b) For the same wire size and current, find the drift speed (in m/s) of electrons if the wire is made of aluminum with n = 2.11 ✕ 1029 electrons/m3. ???m/sarrow_forward
- A 22-gauge copper wire has a radius of 0.645 mm, is 5.00 m long, and has a resistivity r = 1.72 ´ 10-8 ohm-m. The maximum current for which this wire is rated is 0.920A. What is the maximum electric potential difference that may be applied to this wire without overloading it ?arrow_forwardSuppose you conducted an experiment on an ohmic material. When subjected to a potential difference 1V, the current across the material is 4A; and when the potential difference is increased to 2V, the current across the material increases to 8A.1) What is the resistance of the material? a) 4 Ω b) 0.50 Ω c) 2 Ω d) 0.25 Ω2) If you plot the applied potential difference (y-axis) versus the measured current (x-axis)across the material, what should be the expected value of the y-intercept? a) 0 V b) 0.25 V c) 4 V d) 2 V answer all the questions and put explanation for an upvotearrow_forwardA 580 mm long tungsten wire, with a 0.048 mm diameter circular cross section, is wrapped around in the shape of a coil and used as a filament in an incandescent light bulb. When the light bulb is connected to a battery, a current of 0.536 A is measured through the filament. Tungsten has a resistivity of 4.9 x 10-8 Ohms x m. How many electrons pass through this filament in 5 seconds? What is the resistance of this filament? What is the voltage of the battery that would produce this current in the filament?arrow_forward
- V mercury cell with a capacity of 2.5 A⋅h is used to power a cardiac pacemaker. (a) If the power required is 0.30 mW(1 mW =1 milliwatt =0.001 W), what is the average current?arrow_forwardWhat is the resistance of a 90-cmcm-long piece of carbon with a 2.0 mmmm ×× 2.0 mmmm square cross section?arrow_forwardA 60 W lightbulb has a resistance of 240 Ω. At the operating temperature of the tungsten filament, its resistivity is approximately 5.0 x 10-7 Ω • m. If the wire used to make the filament is 0.040 mm in diameter (a typical value). As described above the length of a 60 W, 240 Ω lightbulb filament was calculated to be 60 cm.a. If the potential difference across the filament is 120 V, what is the strength of the electric field inside the filament?b. Suppose the length of the bulb’s filament were doubled without changing its diameter or the potential difference across it. What would the electric field strength be in this case?c. Remembering that the current in the filament is proportional to the electric field, what is the current in the filament following the doubling of its length?d. What is the resistance of the filament following the doubling of its length?arrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning