Two radio antennas A and B radiate in phase. Antenna B is a distance of 140 m to the right of antenna A. Consider point Q along the extension of the line connecting the antennas, a horizontal distance of 50.0 m to the right of antenna B. The frequency, and hence the wavelength, of the emitted waves can be varied.

What is the longest wavelength for which there will be destructive interference at point ?

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Ответ:

Goosebumpsestoybox

08.02.2021

Physics

The magnitude of the magnetic field near the center of the solenoid is 11.3 mT

Explanation:

No. of turns N = 300

Radius r = 0.040 m

Length of solenoid $L= 40 \times 10^{-2}$ m

Current I = 12 A

For finding the magnetic field near the center of the solenoid is given by,

$B = \frac{\mu _{o} NI }{L}$

Where $\mu _{o} = 4\pi \times 10^{-7}$

$B = \frac{4 \pi \times 10^{-7} \times 300 \times 12}{40 \times 10^{-2} }$

$B = 11.3 \times 10^{-3}$ T

B = 11.3 mT

Therefore, the magnitude of the magnetic field near the center of the solenoid is 11.3 mT

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