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All nuclides with same mass number A are called ______.
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Nuclides with same neutron number N but different atomic number Z are called ______.
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A nucleus of mass number A has a radius R such that ______.
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The total current in a semiconductor is ______.
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A generator has an e.m.f. of 440 Volt and internal resistance of 4000 hm. Its terminals are connected to a load of 4000 ohm. The voltage across the load is ______.
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There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then ______.
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A metal plate can be heated by ______.
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How long can an electric lamp of 100 W be kept glowing by fusion of 2 kg of deuterium? Take the fusion reaction as
\[\ce{^2_1H + ^2_1H -> ^3_2He + n + 3.27 MeV}\]
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The primary origin(s) of magnetism lies in ______.
- atomic currents.
- pauli exclusion principle.
- polar nature of molecules.
- intrinsic spin of electron.
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Three identical bar magnets are rivetted together at centre in the same plane as shown in figure. This system is placed at rest in a slowly varying magnetic field. It is found that the system of magnets does not show any motion. The north-south poles of one magnet is shown in the figure. Determine the poles of the remaining two.
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Study the circuits (a) and (b) shown in figure and answer the following questions.
 (a) |
 (b) |
- Under which conditions would the rms currents in the two circuits be the same?
- Can the rms current in circuit (b) be larger than that in (a)?
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Can the instantaneous power output of an ac source ever be negative? Can the average power output be negative?
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The alternating current in a circuit is described by the graph shown in figure. Show rms current in this graph.
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Are the nucleons fundamental particles, or do they consist of still smaller parts? One way to find out is to probe a nucleon just as Rutherford probed an atom. What should be the kinetic energy of an electron for it to be able to probe a nucleon? Assume the diameter of a nucleon to be approximately 10–15 m.
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