Question

Write down the expression of magnetic flux density at the centre of a long solenoid carrying current.

Answer 1

Answer:

A quadratic equation is an equation of the second degree, meaning it contains at least one term that is squared. The standard form is ax² + bx + c = 0 with a, b, and c being constants, or numerical coefficients, and x is an unknown variable. One absolute rule is that the first constant "a" cannot be a zero.

Answer 2

Answer:

For a solenoid of length L = m with N = turns, the turn density is n=N/L= turns/m. The Earth's magnetic field is about half a gauss. The relative permeability of magnetic iron is around 200................

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