Physics 3rd year 1

• 3/1

• 1/3

• 1/6

• 6/1

Each of the four electric circuits contains an ammeter. What is the correct arrangement of the readings A₁, A₂, A₃ and A₄ of the four ammeters ?

• A₄ < A₂ < A₁ < A₃

• A₄ < A₃ < A₁ < A₂

• A₃ < A₄ < A₂ < A₁

• A₁ < A₂ < A₄ < A₃

The opposite figure shows four conductors of uniform cross - sections made of the same materials but with different dimensions, so their correct arrangement in an ascending order according to their electrical resistances ..........

Which combination of the following resistors gives an equivalent resistance of value R ?

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In the opposite electric circuit, when closing the switch (K), which of the following rows shows what happens to the readings of the voltmeters V₁ , V₂ and V₃ correctly?

• a

• b

• c

• d

An electric cell of unknown emf is connected to resistance R₁ hence the intensity of the passing current through the cell equals (0.5 A) as in figure (1) and when replacing resistance R₁ by another resistance R₂ the intensity of the passing current through the cell becomes (0.3 A) as in figure (2) , so the emf of the cell equals .........

• 1.2 V

• 1.5 V

• 2 V

• 3 V

Four equals resistors are connected together as in the following figures, so the correct arrangement of the figures from the highest equivalent resistance to the least one is ............... ?

• 4 < 3 < 2 < 1

• 1 < 2 < 3 < 4

• 4 < 1 < 3 < 2

• 1 < 4 < 2 < 3

By applying Kirchhoff's first law at the point (x), so .........?