question_answer

Direction: Q.36 to Q.40

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 uniform, provided that the length of the solenoid is much greater than its diameter. For an "ideal" solenoid, which is infinitely long with turns thighly packed, the magnetic field inside the solenoid is uniform and parallel to the axis, and vanishes outside the solenoid.

Read the given passage carefully and give the answer of the following questions.

                               A Long solenoid has 800 turns per metre length of solenoid. A current of 1.6 A flows through it. The magnetic induction at the end of the solenoid on its axis is:

A)             \[16\times {{10}^{-4}}T\]                 

B)             \[8\times {{10}^{-4}}T\]

C)                         \[32\times {{10}^{-4}}T\]        

D) \[4\times {{10}^{-4}}T\]