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Dmitrij [34]
3 years ago
8

Which law is used to find the magnitude of a magnetic force?

Physics
1 answer:
Talja [164]3 years ago
3 0

Answer:

The Flemings left hand rule is used to find the magnitude of a magnetic force

Explanation:

Fleming's left hand rule states that if the first three fingers are held mutually at right angles to one another, then the fore finger points into the direction of magnetic field the middle finger in the direction of current while the thumb points in the direction of force.

Mathematically

Magnetic Force F= BILsinθ

Where

B= magnetic field density Tesla

I= current

L= length of conductor

θ= angle of conductor with field

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Complete Question

The complete question is shown on the first uploaded image

Answer:

The time taken  is  t  = 6.89 \ hrs

 

Explanation:

From the question we are told that

       The value of  k = 0.15hr^{-1}

       The  the interior temperature is  u(t = 0) =  70 ^oF

         The external temperature is  T  = 11 ^oF

          The required interior temperature is  u_{t} = 32 ^oF

      The newton cooling law is

                      \frac{du}{dt}  =  -k (u -T)

=>                 \frac{du}{u-T}  = - kdt

  Now integrate both sides we have  

                 \int\limits \frac{du}{u-T}  =\int\limits   - kdt

                   ln (u - T) =  -kt + c    

Since c is a constant lnC = c   will also give a constant so

                 ln (u - T) =  -kt + ln C    

       =>       \frac{(u -T)}{C}  =  e^{-kt}

     =>        u = T + Ce^{-kt}  

          substituting value

                  70 = 11 +Ce^{-0* 0.15}

                  C = 59

Hence

        u_t =  11 + 59 e^{-0.15 *t}

       32=  11 + 59 e^{-0.15 *t}

=>     t  =  -\frac{ln(\frac{21}{59} )}{0.15}

         t  = 6.89 \ hrs

 

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Answer:

d.

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Two loudspeakers emit sound waves along the x-axis. A listener in front of both speakers hears a maximum sound intensity when sp
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Answer

given,

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λ = 0.870 - 0.540

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