Lesson 1 Quiz 2

Charges shown move in the same time with the same speed, then the currents of them will be

• I₃ > I₂ > I₁

• I₃ > I₁ > I₂

• I₃ > I₂ = I₁

• I₃ = I₂ = I₁

In the opposite solid conductor which is used in the flow if electromagnetic waves, the ratio I_A / I_B

• 1 A

• 2 A

• 4 A

• 16 A

In the figure, 4 charges put on a circular plate of radius r, they rotate by frequency f, then the current resulting on the motion of charges is

• 4Qf

• 4Q/f

• 8πrQf

Based on Bohr's mode] for the hydrogen atom, the electron moves in a circular path of radius 0.53 A^o with a speed of 2.2 x 10⁶ m/s, then the ctment intensity due to the motion of the electron equals · · ·

• 3.141 mA

• 6.282 mA

• 1.166 mA

• 1.057 mA

One charge is positive (+Q) and the other three are negative (−Q). The ring rotates with an angular velocity ω. What is the magnitude and direction of the resulting current? , given that f is the frequrency

ω = 2πf

The equivalent for Volt is

• J/C

• J/A.s

• A.Ohm

• All of them

If the potential difference at an electric power statoin is (V) and current intensity is (I) and resistance of wires is (R) then the power consumed in wires is given by this relation ......

• V²R

• I²R

• I²V

• All of them

In a hydrogen gas discharge tube, it was found that 6×10¹⁸ electrons per second flow from left to right, and 4×10¹⁸ protons per second flow from right to left. What is the magnitude and direction of the resulting current?

• 1.6 A from left to right

• 1.6 A from right to left

• 0.8 A from left to right

• 0.8 A from right to left