In the demonstration where a magnet is brought near a loop, what determines the induced current? the strength of the magnetic field intercepted by the loop the spacing of the magnetic field lines intercepted by the loop the rate at which the number of magnetic field lines intercepted by the loop changes the number of magnetic field lines intercepted by the loop
In the demonstration where a loop is pulled out of a magnetic field, which gives the power of your pull? It is the ratio of the speed at which the loop moves to your force. It is the ratio of your force to the speed at which the loop moves. It is the product of your force and the speed at which the loop moves.
Which is true? A changing magnetic field produces a constant perpendicular magnetic field. A changing magnetic field produces a changing perpendicular magnetic field. A changing magnetic field produces a constant parallel magnetic field. A changing magnetic field produces a changing parallel magnetic field. A changing magnetic field produces an electric field.
Which is true about the inductance of an inductor? It is equal to the ratio of the current to the magnetic flux linkage. It is equal to the product of the current and the magnetic flux linkage. It is equal to the ratio of the magnetic flux linkage to the current.
The current though an inductor increases at a certain rate. Which is true about the self-induced emf of the inductor? It is zero. It increases in proportion to the current. It decreases at a constant rate. It has a constant, nonzero value.
When the electric field magnitude in the capacitor is maximum, which is true about the magnetic field magnitude in the inductor? It is maximum. It is half maximum. It is one-fourth maximum. It is zero.
In a damped RLC circuit, what is the action of the resistor? to increase the inductance to increase the current in the inductor to increase the total energy to dissipate energy to decrease the inductance to increase the potential difference across the capacitor
In an ac circuit, how does the rate of current reversal compare to the frequency of the circuit? The reversal rate is equal to the circuit frequency. The reversal rate is one half of the circuit frequency. The reversal rate is twice the circuit frequency.
In a driven RLC circuit, which is true about the emf phasor? It is equal to sum of the R voltage phasor and the L voltage phasor, minus the C voltage phasor. It is equal to the sum of the C voltage phasor, the R voltage phasor, and the L voltage phasor. It is equal to the C voltage phasor minus the sum of the R voltage phasor and the L voltage phasor. It is equal to the R voltage phasor minus the sum of the L voltage phasor and the C voltage phasor. It is equal to the L voltage phasor minus the sum of the R voltage phasor and the C voltage phasor. It is equal to sum of the R voltage phasor and the C voltage phasor, minus the L voltage phasor. It is equal to sum of the L voltage phasor and the C voltage phasor, minus the R voltage phasor.
Which describes the root-mean-square value and the amplitude, for either current or voltage? The rms value is the product of the amplitude and the square root of 2. The rms value is the ratio of the square root of 2 to the amplitude. The rms value is the ratio of the amplitude to the square root of 2.
A toroid has a square cross section with inner radius R1 = 0.050 m and outer radius R2 = 0.060 m. If it has N = 100 loops, calculate the total flux of the magnetic field through one of the loops if the current is i = 2.0 A? 4.4×10−7 Wb 4.6×10−7 Wb 7.3×10−8 Wb 2.5×10−6 Wb
At time t = 0, the charge on the 50−μF capacitor in an LC circuit is 15 μC, and there is no current. If the inductance is 20 mH, the maximum current is 15 A. 15 μA. 15 mA. 6.7 mA. 15 nA.
In an oscillating LC circuit, the total stored energy is U, and the maximum charge on the capacitor is Q. When the charge on the capacitor is Q/2, the energy stored in the inductor is U/4. 4U/3. U/2. 3U/2. 3U/4.
A toroid of rectangular cross section has height h = 0.01384 m, inner radius r1 = 0.02018 m and outer radius r2 = 0.06768 m. If it has N = 216 loops, calculate the total flux of the magnetic field through one of the loops if the current is i = 3.13 A. Hint: you can use the fact that the inductance of the toroid is L = μ0N2h 2πln(r2 r1). Wb
Lenz's law states that the magnetic field produced by an induced current produces no flux through the loop of the circuit. opposes the change in magnetic flux which led to the associated EMF. opposes the magnetic flux which led to the associated EMF. is equal to the electric field.
The figure below shows a series of positions for a loop of wire moving to the right through a circular region of constant magnetic field pointing out of the page. In which position does the loop experience a force pointing to the left? Position 4 Position 2 Position 1 Position 3
An RL series circuit is connected to an ac generator with a maximum emf of 20.0 V. If the maximum potential difference across the resistor is 16 V, then the maximum potential difference across the inductor is 4.0 V. 2.0 V. 26 V. 36 V. 12 V
An RC series circuit is connected to an ac generator with a maximum emf of 25 V. If the maximum potential difference across the resistor is 15 V, then the maximum potential difference across the capacitor is 20 V. 10 V. 30 V. 5 V. 40 V.
An LC circuit has an inductance of 30.0 mH and a capacitance of 6.0 μF. At time t = 0, the charge on the capacitor is 4.0 μC, and the current is 6.0 mA. The total energy is 7.9×10−7 J. 1.9×10−6 J. 1.3×10−6 J. 3.7×10−6 J. 5.4×10−7 J.
The figure below shows a loop of wire of radius r = 0.770 m and resistance R = 0.0210 Ω inside a region of spatially constant magnetic field with time dependent magnitude B = bt Find the time at which the net magnetic field at the center of the loop vanishes. s
For an RLC circuit in the limit of a very high driving frequency, what is the effective behavior of the capacitor and inductor? The capacitor acts like a very small resistance, and the inductor acts like a very large resistance. Both the capacitor and inductor act like very large resistances. Both the capacitor and inductor act like very small resistances. The inductor acts like a very small resistance, and the capacitor acts like a very large resistance.
An LC circuit has a capacitance of 30.0 μF and an inductance of 15.0 mH. At time t = 0, the charge on the capacitor is 10.0 μC, and the current is 20.0 mA. The maximum charge on the capacitor is 16.7 μC. 10.5 μC. 24.3 μC. 12.0 μC. 8.94 μC.
A 120-g block on the end of a spring with a spring constant of 25 N/m is pulled aside 15 cm and released from rest. In the electrical analog, the initial charge on the capacitor is 0.15 C. 0.12 C. 3.8 C. 12 C. 25 C.
A 150-g block on the end of a spring with a spring constant of 35 N/m is pulled aside 25 cm and released from rest. In the electrical analog the initial charge on the capacitor is: 0.15 C 0.25 C 8.8 C 15 C 35 C
An electric generator contains a coil of 83 turns of wire, each forming a rectangular loop 50.8 cm by 24.8 cm. The coil is placed entirely in a uniform magnetic field with magnitude B = 3.38 T and initially perpendicular to the coil's plane. What is in volts the maximum value of the emf produced when the loop is spun at 1070 rev/min about an axis perpendicular to the magnetic field? Number Units
The current i through a 5.0 H inductor varies with time t as shown by the graph of the figure. The inductor has a resistance of 17 Ω. Find the magnitude of the induced emf ε during the time intervals (a) t = 0 to 2 ms; (b) 2 ms to 5 ms, and (c) 5 ms to 6 ms. (Ignore the behavior at the ends of the intervals.)