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important topics of Physics class 12 CBSE

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Three bulbs, each having a resistance of 180 Ω, are connected in parallel to an ideal battery of emf

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The resistance of the rheostat shown in figure (32-E5) is 30 Ω. Neglecting the meter resistance, fin

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If the reading of ammeter A1 in figure (32-E4) is 2. 4 A, what will the ammeters A2 and A3 read ?

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A battery of emf 100 V and a resistor of resistance 10 kΩ are joined in series. This system is used

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Consider N = n1n2 identical cells, each of emf E and internal resistance r. Suppose n1 cells are joi

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The potential difference between the terminals of a 6.0 V battery is 7.2 V when it is being charged

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The current in a conductor and the potential difference across its ends are measured by an ammeter a

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The resistances of an iron wire and a copper wire at 200 ⁰C are 3.9 Ω and 4.1 Ω respectively. At wha

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Figure (32-E1) shows a conductor of length l having a circular cross section. The radius of cross se

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Consider a wire of length 4 m and cross-sectional area 1 mm 2 carrying a current of 2 A. If each cu

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A wire of length 1 m and radius 0. 1 mm has a resistance of 100 Ω.Find the resistivity of the mater

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The number density of free electrons in a copper conductor estimated in Example 3.1 is 8.5 × 1028 m–

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Determine the current in each branch of the network shown in Fig. 3.20:

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A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 × 1

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A battery of emf 10 V and internal resistance 3 W is connected to a resistor. If the current in the

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The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4 W,

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A 12pF capacitor is connected to a 50V battery. How much electrostatic energy is stored in the capac

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faraday law, short video #shorts

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Explain what would happen if in the capacitor given in Exercise 2.8, a 3 mm thick mica sheet (of die

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In a parallel plate capacitor with air between the plates, each plate has an area of 6 × 10–3 m2 an

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Three capacitors of capacitances 2 pF, 3 pF and 4 pF are connected in parallel. (a) What is the tota

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Three capacitors each of capacitance 9 pF are connected in series. (a) What is the total capacitance

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A spherical conductor of radius 12 cm has a charge of 1.6 × 10–7C distributed uniformly on its surfa