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Why steel is preferred in making Robots?
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Discuss the functions of key components in Robots?
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Elaborate any two types of Robots with relevant examples.
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The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10Ω is ______.
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What do you mean by internal resistance of a cell?
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Explain the determination of the internal resistance of a cell using voltmeter.
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Three identical lamps each having a resistance R are connected to the battery of emf as shown in the figure.
Suddenly the switch S is closed.
- Calculate the current in the circuit when S is open and closed.
- What happens to the intensities of the bulbs A, B and C.
- Calculate the voltage across the three bulbs when S is open and closed.
- Calculate the power delivered to the circuit when S is opened and closed.
- Does the power delivered to the circuit decrease, increase or remain same?
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A cell supplies a current of 0.9 A through a 2 Ω resistor and a current of 0.3 A through a 7 Ω resistor. Calculate the internal resistance of the cell.
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Determine the current flowing through the galvanometer (G) as shown in the figure.
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The BH curve for a ferromagnetic material is shown in the figure. The material is placed inside a long solenoid which contains 1000 turns/cm. The current that should be passed in the solenonid to demagnetize the ferromagnet completely is
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What is magnetic susceptibility?
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Compare dia, para and ferromagnetism.
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Give the properties of dia/para/ferromagnetic materials.
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What happens to the domains in a ferromagnetic material in the presence of external magnetic field?
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Compare the properties of soft and hard ferromagnetic materials.
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The flux linked with a coil at any instant t is given by ΦB = − 10t2 - 50t + 250. The induced emf at t = 3 s is
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The current i flowing in a coil varies with time as shown in the figure. The variation of induced emf with time would be
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In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor when the energy is stored equally between the electric and magnetic fields is
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Mention the ways of producing induced emf.
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How will you induce an emf by changing the area enclosed by the coil?
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