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#1 Class 12 Physics Moving Charges and Magnetism 2024 Short 3M

(a) Two long, straight, parallel conductors carry steady currents in opposite directions. Explain the nature of the force of interaction between them. Obtain an expression for the magnitude of the force between the tw...

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#2 Class 12 Physics Electromagnetic Induction 2024 Short 3M

A 100-turn coil of radius 1.6 cm and resistance $5.0\ \Omega$ is co-axial with a solenoid of 250 turns/cm and radius 1.8 cm. The solenoid current drops from 1.5 A to zero in 25 ms. Calculate the current induced in the...

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#3 Class 12 Physics Electromagnetic Waves 2024 Short 3M

(a) On what factors does the speed of an electromagnetic wave in a medium depend? (b) How is an electromagnetic wave produced? (c) Sketch a schematic diagram depicting the electric and magnetic fields for an electroma...

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#4 Class 12 Physics Current Electricity 2024 Short 3M

The figure shows a circuit with three ideal batteries (3V between A-G, 6V between B-F, 6V between C-D), with resistors $2\Omega$ (A-B), $2\Omega$(B-C), $4\Omega$(B-F), $2\Omega$(C-D), $2\Omega$(G-F). Find the magnitud...

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#5 Class 12 Physics Semiconductor 2024 Short 2M

How does the effective energy gap of an intrinsic semiconductor change when it is doped with (a) a trivalent impurity, and (b) a pentavalent impurity? Justify your answer in each case.

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#6 Class 12 Physics Nuclei 2024 Short 2M

The carbon isotope $^{12}_6C$ has a nuclear mass of 12.000000 u. Calculate the binding energy of its nucleus. Given: $m_p=1.007825$ u, $m_n=1.008665$ u.

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#7 Class 12 Physics Ray Optics and Optical Instruments 2024 Short 2M

A convex lens ($n=1.52$) has a focal length of 15.0 cm in air. Find its focal length when it is immersed in a liquid of refractive index 1.65. What will be the nature of the lens (converging or diverging)?

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#8 Class 12 Physics Wave Optics 2024 Short 2M

(b) OR: What is the effect on the interference pattern in Young's double-slit experiment when (i) the source slit is moved closer to the plane of the slits, and (ii) the separation between the two slits is increased? ...

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#9 Class 12 Physics Wave Optics 2024 Short 2M

(a) Two waves, each of amplitude 'a' and frequency '$\omega$', emanating from two coherent sources of light, superpose at a point. If the phase difference between the two waves is $\phi$, obtain an expression for the ...

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#10 Class 12 Physics Current Electricity 2024 Short 2M

Define resistivity of a conductor. How does the resistivity of a conductor depend upon (a) number density of free electrons in the conductor (n), (b) their relaxation time ($\tau$)?

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#11 Class 12 Physics Wave Optics 2024 Long 5M

(b) OR: (i) State Huygens' principle. A plane wave is incident at an angle $i$ on a reflecting surface. Construct the corresponding reflected wavefront. Using this diagram, prove that the angle of reflection equals th...

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#12 Class 12 Physics Ray Optics and Optical Instruments 2024 Long 5M

(a)(i) A ray of light passes through a triangular prism. Show graphically how the angle of deviation varies with the angle of incidence. Hence define the angle of minimum deviation. (ii) A ray of light is incident nor...

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#13 Class 12 Physics Alternating Current 2024 Long 5M

(b) OR: (i) Draw a labelled diagram of a step-up transformer and describe its working principle. Explain any three causes for energy losses in a real transformer. (ii) A step-up transformer converts a low voltage into...

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#14 Class 12 Physics Alternating Current 2024 Long 5M

(a)(i) A resistor and a capacitor are connected in series to an ac source $v=v_m\sin\omega t$. Derive an expression for the impedance of the circuit. (ii) When does an inductor act as a conductor in a circuit? Give re...

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#15 Class 12 Physics Electrostatic Potential and Capacitance 2024 Long 5M

(b) OR: (i) An electric dipole (dipole moment $\vec p = p\hat i$), consisting of charges $-q$ and $q$ separated by distance $2a$, is placed along the x-axis with its centre at the origin. Show that the potential V due...

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#16 Class 12 Physics Electric Charges and Fields 2024 Long 5M

(a)(i) Derive an expression for the potential energy of an electric dipole $\vec p$ in an external uniform electric field $\vec E$. When is the potential energy of the dipole (1) maximum, and (2) minimum? (ii) An elec...

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#17 Class 12 Physics Semiconductor 2024 Long 1M

[Case Study, Q30 contd.] (iv)(a) An alternating voltage of frequency 50 Hz is applied to a half-wave rectifier. Find the ripple frequency of the output. OR (b) A square-wave signal (+5V to −5V) is applied to a p-n jun...

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#18 Class 12 Physics Semiconductor 2024 Long 1M

[Case Study, Q30 contd.] (iii) In a full-wave rectifier:

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#19 Class 12 Physics Semiconductor 2024 Long 1M

[Case Study, Q30 contd.] (ii) In a full-wave rectifier, the current in each of the diodes flows for:

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#20 Class 12 Physics Semiconductor 2024 Long 1M

[Case Study] Junction Diode as a Rectifier: The process of converting ac voltage into dc voltage is called rectification, and the device performing this conversion is called a rectifier. A p-n junction diode offers lo...

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