The bridge is balanced by adjusting the resistance of one of the known resistors until there is no current flowing through the galvanometer. At this point, the ratio of the two known resistances is equal to the ratio of the unknown resistance and the variable resistor. By knowing the values of the two known resistors and the variable resistor, the value of the unknown resistance can be calculated.
The Carey Foster bridge is particularly useful for measuring the resistance of low-value resistors, typically in the range of a few milliohms to a few ohms. It is widely used in scientific and engineering applications, particularly in the fields of electrical engineering and physics.
Physics practicals are laboratory exercises designed to help students understand and apply the principles of physics through hands-on experimentation. These practicals typically involve conducting experiments that explore various physical phenomena, such as motion, energy, electricity, magnetism, and waves. Students are expected to use various instruments and equipment, such as microscopes, oscilloscopes, and balances, to measure and analyze data. Through physics practicals, students develop important scientific skills, such as critical thinking, problem-solving, and data analysis, which are essential for a career in physics or any other field of science.
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