Physics: A 0.90-m steel bar is held with its length parallel to the east-west direction and dropped from a bridge. After it has fallen 32 m, the emf across its length is 9.2 x 10-4 V. Assuming the horizontal component of the earth s magnetic field points directly north, what is the magnitude of the horizontal component of the earth s magnetic field

If an object that is 86kg on the moon then that is the answer, 86kg....

A 0.90-m steel bar is held with its length parallel

Ответ:

angelcjsdfv7139

02.05.2021

Physics

Explanation:

From Faraday's law,

$e m f &=-\frac{d \phi}{d t} \\
&=-\frac{d}{d t}(B A \cos \theta) \\
&=-\frac{d}{d t}(B l h \cos \theta) \\
&=-B l \cos \theta \frac{d h}{d t} \\
&=-B l v \cos 0^{\circ} \\
&=-B l v$

Here, B is the magnetic field, l is the length of the rod, and v is the velocity of the rod.

$e m f &=-B l(\sqrt{2 g h}) \\
9.2 \times 10^{-4} \mathrm{~V} &=-B(0.90 \mathrm{~m})\left(\sqrt{2\left(9.8 \mathrm{~m} / \mathrm{s}^{2}\right)(32 \mathrm{~m})}\right) \\
B &=\frac{9.2 \times 10^{-4} \mathrm{~V}}{(0.90 \mathrm{~m})\left(\sqrt{2\left(9.8 \mathrm{~m} / \mathrm{s}^{2}\right)(32 \mathrm{~m})}\right)} \\
&=0.408 \times 10^{-4} \mathrm{~T}$

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