1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Alexus [3.1K]
3 years ago
9

When a potential difference of 10 V is placed across a certain solid cylindrical resistor, the current through it is 2 A. If the

diameter of this resistor is now tripled, what will be the new current through the resistor?
Physics
1 answer:
Keith_Richards [23]3 years ago
8 0

Answer:

New Resistance = 0.5556 ohm

Explanation:

Resistance = resistivity * length /area

Here since resistivity and length are constant, we only need to see how the resistance increases or decreases with change in area.

New Area = pi * (3*D)^2 / 4

Old Area = pi * D^2 / 4

The ratio of new area / old area is :

\frac{New Area}{Old Area} = 9

Since area increases 9 times, and it is inversely proportional to resistance:

Resistance decreases by 9 times.

So, old resistance = Voltage / Current = 10 / 2 = 5 ohm

New Resistance = 5 / 9 = 0.5556 ohm    (decreases by 9 times)

You might be interested in
How are speed and velocity different?
liubo4ka [24]

Velocity tells you how fast and in what direction. Speed only tells how fast.

4 0
3 years ago
Read 2 more answers
Cobaltâ’60 is a radioactive isotope used to treat cancers of the brain and other tissues. A gamma ray emitted by an atom of this
Crank

Energy of gamma rays is given by equation

E = h\nu

here we know that

h = Planck's constant

\nu = frequency

now energy is given as

E = 4.70 MeV = 4.70 \times 10^6 \times 1.6 \times 10^{-19}

E = 7.52 \times 10^{-13} J

now by above equation

E = h\nu

7.52 \times 10^{-13} = 6.6 \times 10^{-34} \nu

\nu = 1.14 \times 10^{21} Hz

now for wavelength we can say

\lambda = \frac{c}{\nu}

\lambda = \frac{3\times 10^8}{1.14 \times 10^{21}}

\lambda = 2.63 \times 10^{-13} m

3 0
3 years ago
What type of motion is shown with this graph? (5 points)
Vladimir [108]
It should be Constant speed. The line goes straight & doesn’t change within the graph.
7 0
3 years ago
URGENT!!!!! If a 6 Ω resistor is in a circuit connected to a voltage source, and the current through the circuit is 2 amps, what
Eduardwww [97]

Answer:

Explanation:

according to ohms law we know that

v=IR

given current =2 amps

given resistance =6Ω

so voltage is

v=2*6 =12 V

3 0
3 years ago
As in the video, we apply a charge +Q to the half-shell that carries the electroscope. This time, we also apply a charge –Q to t
Andreyy89

Answer:

Explanation:

When the positively charged half shell is brought in contact with the electroscope, its needle deflects due to charge present on the shell.

When the negatively charged half shell is brought in contact with the positively charged shell , the positive and negative charge present on each shell neutralises each other  .So both the shells lose their charges .The positive half shell also loses all its charges

When we separate the half shells , there will be no deflection  in the electroscope because both the shell have already lost their charges and they have become neutral bodies . So they will not be able to produce any deflection in the electroscope.

4 0
3 years ago
Read 2 more answers
Other questions:
  • PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!!
    6·2 answers
  • Which statement BEST explains why the specific heat of water is higher than the specific heat of most other substances? A) Due t
    5·1 answer
  • Why does the liquid rise up through the dip tube when the valve is open
    11·2 answers
  • Summarize how psychology is considered a science.
    8·2 answers
  • Say you dropped a cannonball from the 17–meter mast of a ship sailing at 2 meters/second. How far from the base of the mast will
    6·1 answer
  • You create a plot of voltage (in V) vs. time (in s) for an RC circuit as the capacitor is charging, where V=V_{0} \cdot \left(1-
    11·1 answer
  • A ball is launched at 40m/s. find its speed at the half way up point.
    12·1 answer
  • A substance has density ρ, mass m, and volume V. If the volume is tripled, what is the new mass?
    14·1 answer
  • Please help, I need help with this test question
    13·1 answer
  • Only Wednesdays <br> Pls help
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!