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CBSE Class 12 Physics Solved Question Paper 2016

Short Answer Type

A point charge +Q is placed at point O as shown in the figure. Is the potential
difference V_A – V_B is positive, negative or zero?

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2. How does the electric flux due to a point charge enclosed by a spherical Gaussian surface get affected when its radius is increased?

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3. Write the underlying principle of a moving coil galvanometer.

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4. Why are microwaves considered suitable for radar systems used in aircraft navigation?

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5. Define 'quality factor' of resonance in a series LCR circuit. What is its SI unit?

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6. Two cells of emfs 1.5 V and 2.0 V, having internal resistances 0.2 Ω and 0.3 Ω, respectively, are connected in parallel. Calculate the emf and internal resistance of the equivalent cell.

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7. A charge is distributed uniformly over a ring of radius 'a'. Obtain an expression for the electric intensity E at a point on the axis of the ring. Hence, show that for points at large distance from the ring, it behaves like a point charge.

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a) Write the expression for the magnetic force acting on a charged particle moving with velocity v in the presence of magnetic field B.

b) A neutron, an electron and an alpha particle, moving with equal velocities, enter a uniform magnetic field going into the plane of paper, as shown. Trace their paths in the field and justify your answer.

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9.
i) Define mutual Inductance.

ii) A pair of adjacent coils has a mutual inductance of 1.5 H. If the current in one coil changes 20 A in 0.5 s, what is the change of flux linkage with the other coil?

i) Mutual Induction: It is the phenomenon in which a change of current in one coil induces an emf in another coil places near it. The coil in which the current changes is called the primary coil and the coil in which the emf is induced is called the secondary coil.

ii)

EMF induced is, e = - M .

So, the flux linked with the other coil is given by,

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10. Two parallel-plate capacitors X and Y have the same area of plates and same separation between them. X has air between the plates, while Y contains a dielectric medium of