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Dennis_Churaev [7]
3 years ago
5

A Scalar can only be a positive quantity that has a magnitude but no direction ? a)-True b)-False

Engineering
1 answer:
Bogdan [553]3 years ago
8 0

false

im not sure

but they haven't a direction

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Nadya [2.5K]
The answer is either A or B
3 0
3 years ago
What is the proper distance from the feet of a straight ladder to the wall?
blondinia [14]

Answer:

One Foot

Explanation:

The general rule is to maintain a distance of one foot per four feet of height.

3 0
3 years ago
The primary winding of a 120 volt transformer has 200 turns. The secondary winding has 20 turns. What is the secondary winding v
Katyanochek1 [597]

Answer:

  12 volts

Explanation:

The voltage ratio is equal to the turns ratio.

  secondary/primary = 20/200 = v2/120

  v2 = 120(20/200) = 12

The secondary winding voltage is 12 volts.

6 0
3 years ago
(a) The reverse-saturation current of a pn junction diode is IS = 10−11 A. Determine the diode voltage to produce currents of (i
kirill115 [55]

Answer:

The equation used to solve a diode is

i_d = I_se^\frac{V_d}{V_T}-1

  • i_d is the current going through the diode
  • I_s is your saturation current
  • V_D is the voltage across your diode
  • V_T is the voltage of the diode at a certain room temperature. by default, you always use V_T=25.9mV for room temperature.

If you look at the equation, i_d = I_se^\frac{V_d}{V_T}-1, you'd notice that the e^\frac{V_d}{V_T} grow exponentially fast, so we can ignore the -1 in the equation because it's so small compared to the exponential.

i_d = I_se^\frac{V_d}{V_T}-1

i_d\approx I_se^\frac{V_d}{V_T}

Therefore, use i_d= I_se^\frac{V_d}{V_T} to solve your equation.

Rearrange your equation to solve for V_D.

V_D=V_Tln(\frac{i_D}{I_s})

a.)

i.)

You're given I_s=10^{-11}A

at i_d=10\mu A,     V_D=V_Tln(\frac{i_D}{I_s})=(25.9\cdot10^{-3})ln(\frac{10\cdot10^{-6}}{10\cdot10^{-11}})=.298V

at i_d=100\mu A,   V_D=V_Tln(\frac{i_D}{I_s})=(25.9\cdot10^{-3})ln(\frac{100\cdot10^{-6}}{10\cdot10^{-11}})=.358V

at i_d=1mA,      V_D=V_Tln(\frac{i_D}{I_s})=(25.9\cdot10^{-3})ln(\frac{1\cdot10^{-3}}{10\cdot10^{-11}})=.417V

<em>note: always use</em>  V_T=25.9mV

ii.)

Just repeat part (i) but change to I_s=-5\cdot10^{-12}A

b.)

same process as part A. You do the rest of the problem by yourself.

4 0
4 years ago
What is the general term for a substance that is harmful to life and may cause death?
lukranit [14]
Toxic is the answer, toxic meaning may cause death or other health problems.
7 0
4 years ago
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