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Plte cpcitor. When you pull the pltes prt to lrger seprtion nd bttery remins connected to the cpcitor Decreses The resonnt ngulr frequency of series RLC circuit

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  1.  Three identical capacitors connected in series. What single capacitance C is “equivalent” to this combination?
  •   (1/3)C
  1.  You charge parallel-plate capacitor. When you pull the plates apart to a larger separation and  battery remains connected to the capacitor
  •  Decreases
  1.  The resonant angular frequency of series RLC circuit is
  •  1/(LC)1/2
  1.  A wire of area 2 mm2 carries a current of 0.4mA. The average current density is
  •  200 A/m2

  1.  A square loop of side 0.1m carries 2A current. The magnetic dipole moment of the loop is
  •  2*10-2 Am2
  1.  Current 0.5A flows in square wire loop of 10 cm side. What is magnetic dipole moment of the loop?
  •  0.005 Am2
  1.  Of the three chief kinds of magnetic materials (diamagnetic, paramagnetic and ferromagnetic), which are used to make permanent magnets?
  •  Only ferromagnetic
  1.  In a photoelectric experiment at a frequency above cut off, the stopping potential is proportional to:
  •  The energy of the most energetic electrons after it is ejected
  1.  What is the maximal number of electrons at shell with n=3
  •  18
  1.  For the serial circuit work out the readings on the voltmeters V1 and V2 given the following values for R1=2Ohm and R2=10 Ohm, I1=1A, I2=1A
  •  V1=2V; V2=10V;
  1.  What is a good insulator of electricity?
  •  Rubber
  1.  Induction current opposes the reason causing it. It is the shortest formulation of
  •  Lentz law
  1.  Potential energy of current carrying loop with magnetic dipole moment µ=1Am2 in magnetic field B of 0.1T, when B and µ make angle 600 is
  •  -0.05J
  1.  Paramagnetism is closely associated with
  •  The tendency of electron dipole moments to align with an applied magnetic field
  1.  In an electromagnetic wave E0=3*106V/m. B0 equals
  •  10-2T
  1.  What is an insulator of electricity?
  •  A material that doesn’t allow the free electrons to easily travel through it.
  1.  Ohm’s law in differential form is
  •  j=γE, where j is a current density, γ is a conductivity
  1.  The total number of electron states with n=3 and l=1 for an atom is:
  •  six
  1.  The thermal conductivity is the analog to:
  •  Diffusivity
  1.  On what picture you can see non –uniform electric field?
  •  

  1.  Resistance of metals in classical theory of electric conductivity is caused by
  •  Collision of free electrons with ions of crystal structure

  1.  Which relation defines equipotential surface:
  •  
  1.  Electric theory of dispersion was evaluated by:
  •  Lorentz
  1.  Formula for energy density of electric field is
  •  
  1.  Loop is uniformly rotating with angular velocity ω in uniform magnetic field. Loop has N coils and area of the loop is S. Rotating axis lies on loop’s plane and perpendicular to induction. What is the maximal EMF appeared in the loop:
  •  NBSω

  1.  Current I=1A goes through the inductance with inductivity L=10-3H. What is the magnetic flux through inductance:
  •  10-3Wb
  1.  A toaster is rated at 600W when connected to a 120V source. What current does the toaster carry?
  •  5A
  1.  Charge carries in metals are
  •  only electrons
  1.  An electrton traveling with speed v around a circle of radius r is equivalent to a current of:
  •  ev/2πr
  1.  The emf inducted in an isolated circuit when the current in the circuit is changing by 10 A/s is 0.3 V. What is the self-inductance?
  •  30 mH
  1.  The magnetic field for a given electromagnetic wave has Bmax = 10-6T. Emax equals
  •  3*102 V/m
  1.  An electromagnetic field propagates in +x direction. The electric field at a point in space is momentarily oriented in –z direction. The magnetic field at that point is momentarily oriented in
  •  –y direction
  1.  In RLC circuit angular frequency of AC source rises. Inductive reactance
  •  Increases
  1.  Magnetic flux through closed conducting loop changed from 10Wb to 5Wb in 10ms. The average EMF induced in the loop is  
  •  -500V
  1.  The magnitude of emf induced in an isolated circuit when the current in the circuit is changing by -10A/s is 0.2 V. What is the self-inductance?
  •  20mH
  1.  The rapid exponential decay in just a few cycles of the charge on the plates of capacitor in an RLC circuit might be due to:
  •  a large resistance
  1.  Intrinsic semiconductors are
  •  Pure elemental materials without impurities
  1.  In a charge-free region of space, closed container is placed in an electric field. A requirement for the total electric flux through the surface of the container to be zero is that
  •  The requirement does not exist – the total electric flux is zero no matter what




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2. соціологія Головна праця Конта Курс позитивної філософії публікувалася з 1832 до 1842 рр
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4. трудовых отношений присущий рыночному обществу обеспечивающий оптимальный баланс реализации основных ин
5. мышь Проводник Работа с окнами
6. РЕФЕРАТ дисертації на здобуття наукового ступеня кандидата медичних наук2
7. деловой Научный Публицистический Литературнохудожественный.
8. Экономика отрасли
9. Шпаргалка- Невропатология
10. Лабораторная работа 10 Задача 1 В данном случае имеют место сезонные колебания исключени

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