Please help me idk this

d. too much screen time can cause depression, anxiety, and social isolation.

Explanation:

this has been researched and is proven that consuming too much screen time can cause an individual to become more attached to the device and feel anxious or even depressed if their not able to access the internet or their phones. Screen time is also addictive, which causes some to experience anti-social or possibly agressive behaviour.

we should all just get dogs.

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: