Objective Questions
... 3. Is it possible to orient a current loop in a uniform magnetic field such that the loop does not tend to rotate? Explain. 4. Explain why it is not possible to determine the charge and the mass of a charged particle separately by measuring accelerations produced by electric and magnetic forces on t ...
... 3. Is it possible to orient a current loop in a uniform magnetic field such that the loop does not tend to rotate? Explain. 4. Explain why it is not possible to determine the charge and the mass of a charged particle separately by measuring accelerations produced by electric and magnetic forces on t ...
Objective Questions
... 21. A 2.00-m length of wire is held in an east–west direction and moves horizontally to the north with a speed of 0.500 m/s. The Earth’s magnetic field in this region is of magnitude 50.0 T and is directed northward and 53.0 below the horizontal. (a) Calculate the magnitude of the induced emf betw ...
... 21. A 2.00-m length of wire is held in an east–west direction and moves horizontally to the north with a speed of 0.500 m/s. The Earth’s magnetic field in this region is of magnitude 50.0 T and is directed northward and 53.0 below the horizontal. (a) Calculate the magnitude of the induced emf betw ...
waves in elastic medium and acoustics
... Neither a force nor a torque. When an electric dipole is placed in a uniform electric field a couple acts on it. The moment of couple will be maximum when the dipole is placed : (a) Along the direction of the filed (b) Perpendicular to the direction of the field (c) Against the direction of the fiel ...
... Neither a force nor a torque. When an electric dipole is placed in a uniform electric field a couple acts on it. The moment of couple will be maximum when the dipole is placed : (a) Along the direction of the filed (b) Perpendicular to the direction of the field (c) Against the direction of the fiel ...
E - UniMAP Portal
... conductivity, σ ≈ 0 – no current can flow through dielectric No ohmic losses occur anywhere in capacitor When a source is connected to a capacitor, energy is stored in capacitor Charging-up energy is stored in the form of electrostatic potential energy in the dielectric medium ...
... conductivity, σ ≈ 0 – no current can flow through dielectric No ohmic losses occur anywhere in capacitor When a source is connected to a capacitor, energy is stored in capacitor Charging-up energy is stored in the form of electrostatic potential energy in the dielectric medium ...
Resistance Lesson Plan – John Nice South Gwinnett High School
... Ohm’s Law describes the relationship between current, electric potential difference (voltage) and resistance. Resistance can be defined as the ratio of the voltage to the current. Commonly, Ohm’s Law is written as V=IR, where resistance is a constant in the problem. Many materials follow Ohm’s Law a ...
... Ohm’s Law describes the relationship between current, electric potential difference (voltage) and resistance. Resistance can be defined as the ratio of the voltage to the current. Commonly, Ohm’s Law is written as V=IR, where resistance is a constant in the problem. Many materials follow Ohm’s Law a ...
Magnetism Practice Quiz
... the south pole of another magnet, the poles will a. repel each other. b. attract each other. c. not interact with each other at all. 18. If you break a bar magnet in half, each half a. becomes a bar magnet with two poles. b. becomes unmagnetized. c. contains one magnetic pole. ...
... the south pole of another magnet, the poles will a. repel each other. b. attract each other. c. not interact with each other at all. 18. If you break a bar magnet in half, each half a. becomes a bar magnet with two poles. b. becomes unmagnetized. c. contains one magnetic pole. ...
1 Ω, What is the potential difference V -V
... Consider a rectangular loop of width a = 20.0 cm and length b = 30.0 cm. Half the loop is located in a region that has a magnetic field of magnitude B= 0.90 T directed into the page, as shown in Figure 13 (Over head view). The resistance of the coil is R= 30.0 Ω. At what rate energy is transferred t ...
... Consider a rectangular loop of width a = 20.0 cm and length b = 30.0 cm. Half the loop is located in a region that has a magnetic field of magnitude B= 0.90 T directed into the page, as shown in Figure 13 (Over head view). The resistance of the coil is R= 30.0 Ω. At what rate energy is transferred t ...
Superconductivity
Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in certain materials when cooled below a characteristic critical temperature. It was discovered by Dutch physicist Heike Kamerlingh Onnes on April 8, 1911 in Leiden. Like ferromagnetism and atomic spectral lines, superconductivity is a quantum mechanical phenomenon. It is characterized by the Meissner effect, the complete ejection of magnetic field lines from the interior of the superconductor as it transitions into the superconducting state. The occurrence of the Meissner effect indicates that superconductivity cannot be understood simply as the idealization of perfect conductivity in classical physics.The electrical resistivity of a metallic conductor decreases gradually as temperature is lowered. In ordinary conductors, such as copper or silver, this decrease is limited by impurities and other defects. Even near absolute zero, a real sample of a normal conductor shows some resistance. In a superconductor, the resistance drops abruptly to zero when the material is cooled below its critical temperature. An electric current flowing through a loop of superconducting wire can persist indefinitely with no power source.In 1986, it was discovered that some cuprate-perovskite ceramic materials have a critical temperature above 90 K (−183 °C). Such a high transition temperature is theoretically impossible for a conventional superconductor, leading the materials to be termed high-temperature superconductors. Liquid nitrogen boils at 77 K, and superconduction at higher temperatures than this facilitates many experiments and applications that are less practical at lower temperatures.