A wire solenoid has 220 loops and a length of 5.5 cm. A 2.3-A current passes through the wire. The magnetic field inside the solenoid is
A) 12 mT.
B) 6.1 mT.
C) 56 mT.
D) 77 mT.

Question

Quizplus · Accepted Answer

The magnetic field inside a solenoid is given by:B = μ₀nIwhere:μ₀ is the permeability of free space (4π × 10^-7 T·m/A)n is the number of turns per unit length (in this case, 220 loops / 0.055 m = 4000 turns/m)I is the current (2.3 A)Plugging in these values, we get:B = (4π × 10^-7 T·m/A) × (4000 turns/m) × (2.3 A) = 12 mTTherefore, the correct answer is A.

A Wire Solenoid Has 220 Loops and a Length of 5.5