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#1 Class 12 Physics Alternating Current 2026 Long 5M CBSE

(i) A light bulb and an open coil inductor are connected in series across an ac source of variable frequency. How will the glow of the bulb be affected when: (I) an iron bar is inserted inside the coil, and (II) the f...

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#2 Class 12 Physics Moving Charges and Magnetism 2023 Long 1M CBSE

Case Study (Charged particles): Particle 1 (mass $m$, charge $-q$, KE $K_1$) and particle 2 (mass $\frac{m}{2}$, charge $+2q$, KE $K_2$). Q (OR part b): If the momenta of particles 1 and 2 are $p_1$ and $p_2$, then:

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#3 Class 12 Physics Moving Charges and Magnetism 2023 Long 1M CBSE

Case Study (Charged particles): Particle 1 (mass $m$, charge $-q$) and particle 2 (mass $\frac{m}{2}$, charge $+2q$) in a magnetic field $B$. Q (OR part a): If the period of revolution for particle 1 is 4 s, then for ...

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#4 Class 12 Physics Moving Charges and Magnetism 2023 Long 1M CBSE

Case Study (Charged particles): Particle 1 (charge $-q$) and particle 2 (charge $+2q$) enter the magnetic field $\vec{B}=B_0\hat{k}$ with velocities $\vec{v_1}=v_1\hat{i}$ and $\vec{v_2}=v_2\hat{i}$. Q: Then:

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#5 Class 12 Physics Moving Charges and Magnetism 2023 Long 1M CBSE

Case Study (Charged particles): Particle 1 (mass $m$, charge $-q$) and particle 2 (mass $\frac{m}{2}$, charge $+2q$) accelerated through the same $V$, then enter a magnetic field $B$ perpendicular to velocity. Q: The ...

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#6 Class 12 Physics Moving Charges and Magnetism 2023 Long 1M CBSE

Case Study (Charged particles): Two charged particles 1 and 2 have masses $m$ and $\frac{m}{2}$ and charges $-q$ and $+2q$ respectively. They are accelerated from rest through the same potential difference $V$, gainin...

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#7 Class 12 Physics Nuclei 2023 Short 3M CBSE

Draw a plot showing the variation of potential energy of a pair of nucleons as a function of their separation ($r$). Using this plot, show that the nuclear force is (i) attractive for $r>r_0$, and (ii) repulsive fo...

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#8 Class 12 Physics Nuclei 2023 Short 3M CBSE

A deuterium nucleus and an alpha particle approach a target nucleus separately in head-on position. Find the ratio of their distances of closest approach to the nucleus when both have (a) the same velocity, and (b) th...

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#9 Class 12 Physics Electromagnetic Induction 2023 Short 3M CBSE

State Faraday's law of electromagnetic induction. Briefly describe two methods for producing induced emf.

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#10 Class 12 Physics Ray Optics and Optical Instruments 2023 Short 3M CBSE

A ray of light is incident at an angle of $45^\circ$ on one face of a prism with an equilateral triangular base. If it passes symmetrically through the prism, find: (a) the angle of minimum deviation, and (b) the refr...

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#11 Class 12 Physics Alternating Current 2026 Short 3M CBSE

A series combination of circuit elements X and Y is connected across an ac source. The voltage is ahead of the current in phase by $\frac{\pi}{4}$ radian. When element Y is replaced by element Z, the current leads the...

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#12 Class 12 Physics Ray Optics and Optical Instruments 2023 Short 3M CBSE

Define the term 'critical angle'. A small bulb is placed at the bottom of a tank containing a liquid of refractive index $\mu$ at a depth $H$. Light emerges from a circular area of radius $r$ at the surface. Obtain th...

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#13 Class 12 Physics Nuclei 2023 Short 3M CBSE

Differentiate between nuclear fission and nuclear fusion. Give one example of each with the nuclear reaction.

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#14 Class 12 Physics Ray Optics and Optical Instruments 2023 Short 3M CBSE

A ray of light is travelling through a rectangular glass slab (refractive index $\frac{3}{2}$) and is incident on the horizontal glass-air surface at the critical angle for the two media. The slab is then brought in c...

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#15 Class 12 Physics Electromagnetic Waves 2023 Short 3M CBSE

(a) Depict the variation of electric field ($\vec{E}$) and magnetic field ($\vec{B}$) with respect to the direction of propagation of an electromagnetic wave. Write their two important characteristics. (b) Show that $...

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#16 Class 12 Physics Alternating Current 2026 Short 3M CBSE

(a) Discuss the behaviour of an inductor connected to (i) a dc source, and (ii) a high frequency ac source. (b) What is the phase relation between current and voltage in an ideal inductor connected to an ac source? Dr...

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#17 Class 12 Physics Moving Charges and Magnetism 2023 Short 3M CBSE

An alpha particle (mass $6.4\times10^{-27}$ kg and charge $3.2\times10^{-19}$ C) having 8.0 MeV energy enters a region of a uniform magnetic field of 0.5 T directed perpendicular to its velocity. Find the radius of th...

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#18 Class 12 Physics Moving Charges and Magnetism 2023 Short 3M CBSE

A circular coil of 30 turns and radius 8.0 cm carrying a current of 6 A is suspended vertically in a uniform horizontal magnetic field of 1.0 T. The field lines make an angle of $30^\circ$ with the plane of the coil. ...

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#19 Class 12 Physics Current Electricity 2026 Short 3M CBSE

(a) Establish the relation between drift velocity of electrons ($v_d$) and electric current ($I$) in a conductor. (b) How is $v_d$ affected when the length of the conductor is doubled, keeping the voltage applied acro...

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#20 Class 12 Physics Wave Optics 2023 Short 2M CBSE

In Young's double slit experiment, the central maximum is bright in the interference pattern obtained on a screen. What will happen when: (a) light waves emitted from slits $S_1$ and $S_2$ have an initial phase differ...

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