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| Magnetic Field Due to solenoid |
| A solenoid is a long coil of wire tightly wound in the helical form. Solenoid consists of closely stacked rings electrically insulated from each other wrapped around a non-conducting cylinder. Figure below shows the magnetic field lines of a solenoid carrying a steady current I. We see that if the turns are closely spaced, the resulting magnetic field inside the solenoid becomes fairly uniformly, provided that the length of the solenoid is much greater than its diameter. For an "ideal" solenoid, which is infinitely long with turns tightly packed, the magnetic field inside the solenoid is uniform and parallel to the axis, and vanishes outside the solenoid. |
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A) \[16\times {{10}^{-4}}\,T\]
B) \[8\times {{10}^{-4}}\,T\]
C) \[32\,\times {{10}^{-4}}\,T\]
D) \[4\times \,{{10}^{-4}}T\]
Correct Answer: B
Solution :
as \[B=\frac{{{\mu }_{0}}nI}{2}=\frac{\left( 4\pi \times {{10}^{-7}} \right)\times 800\times 1\,.\,6}{2}\] \[=8\times {{10}^{-4}}T\]
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