The model of the atom has changed over time in light of new knowledge and discoveries. which option correctly describes one such change? a. about 1915, jj. thompson developed an atomic model where negatively charged particles orbit a positively charged nucleus. b. about 1990, jj. thompson discovered electrons were negatively charged particles. c. in 420 b. c., john dalton developed the idea that small atoms combined to form molecules. d. about 1900, neils bohr developed an atomic model where positively charged particles orbit a negatively charged nucleus.

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

its a 5.5 n

glad that