Answer: b. Electrons move from glass to silk
Explanation:
When the glass rod is rub over against the silk, the glass loses the electrons due to the physical contact with the silk and the friction so produced. The surface of the glass becomes positively charged and the surface of the silk becomes negatively charged. As the surface of the glass loses electrons which are accepted by the silk surface.
<h3>13.</h3>
The relationship between power, voltage, and resistance can be expressed as ...
P = V²/R
Solving for resistance, you find ...
R = V²/P
Filling in the given values, you get ...
R = (120 V)²/(360 W) = 40.0 Ω
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<h3>14.</h3>
⇒ The maximum power the device can dissipate without overheating.
- - - -
In practice, the power rating is chosen to meet several requirements, including legal, liability, reliability, life expectancy, and others. For components, there tend to be tradeoffs between power dissipation and reliability. (Higher reliability parts are given a lower power rating even though the process by which they are made is unchanged.) For appliances, there may be legal requirements involving wiring and insurance and fire protection.
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<h3>15.</h3>
The voltage divider formula is ...
V₁ = V₀×(R₂/(R₁+R₂))
where R₁ is the series resistor and R₂ is the resistor across which the voltage is being measured. V₀ is the voltage applied across the two resistances.
Filling in your numbers, you get
V₁ = 25 V × (7.5/(5+7.5)) = 15 V
Answer:
Current, I = 0.153 A
Explanation:
Given that,
Radius of the circular conducting loop, r = 0.5 m
Resistance of the resistor, 
Magnetic field, B = 1 T
Angle with z axis, 
Magnetic field increases to 10 T in 4 seconds
To find,
Magnitude of current.
Solve,
According to Faraday's law, the induced emf is given by:
are final flux and the initial flux respectively.
The magnitude of current can be calculated using the Ohm's law as :
I = 0.153 A
Therefore, the magnitude of the current that will be caused to flow in the loop is 0.153 A.
Answer:
See explanation
Explanation:
Acids and bases contain ions that interact with water. According to the Arrhenius definition, acids are substances that produce hydrogen ion in water while bases are substances that produce hydroxide ion in water.
The pH scale is a graphic description of the hydrogen or hydroxide ion present in a sample. Since pH= -log[H^+], the higher the pH , the lower the hydrogen ion concentration and vice versa.
Similarly, pOH= -log [OH^-] , hence the more the OH^- concentration the lower the pOH.
However pH + pOH =14.
Thus the concentration of hydrogen or hydroxide ions present determines the pH of any solution.
1.97 E-7 m should be right. I took this a while ago.
