A solenoid is built with 870 turns uniformly distributed over a length of 0.390 m to produce a magnetic field of magnitude 1.00 × 10−4 T at its center. What is current necessary for this to happen? 17.4 mA 35.7 mA 74.9 mA

35.7mA

Explanation:

B= μnI

μ: permeability of free space 4π× 10^-7

n: number of turns per unit length

I: current through the coil

B: magnetic field

1.00 × 10−4= 4π× 10^-7 × 870/0.39×I

I= 35.7mA

the focus of lesson 1 is newton's first law of motion - sometimes referred to as the law of inertia. newton's first law of motion is often stated as. an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

explanation:

they should be similar or the same