Question

A long solenoid consisting of 1.5*10*
turns/m has an area of cross-section of
25 cm. A coil C, consisting of 150 turns
(N) is wound tightly around the centre
of the solenoid Calculate for a current
of 3.0 A in the solenoid
(a) the magnetic flux density at the centre of
the solenoid,
X3
(b) the flux linkage in the coil C,
(c) the average emf induced in coil C if the
current in the solenoid is reversed in
direction in a time of 0.5 s.
(H = 410 * 107 T.m/A)
[Ans: (a) 5.66-10ºT, (b) 2.12-10°Wb, 4
(c) 8.48x10. do. help
[Anm.​

Answer 1

Answer:

The correct option is B 2.12 x 10-3

Explanation:

Here are the calculations:

ΔB = μ n Δ I

    = 4 π x 10-7  x 1.5 x 10exp 3 x 3 = 56.52 x 10exp-4

ΔB = 5.6 x 10exp -3

ϕ  = B.A  

  = 5.6 x 10exp -3 x π  {25°/w} 2

  = 2.12 x 1- exp -3 web

Hence  = 2.12 x 1- exp -3 web is the answer.