Apower source supplies a prescribed voltage and is used to power a light bulb if another light bulb is connected in series to the first how would it affect the current in the power source? .

It would decrease.

Explanation:

From Ohm's law:

I = V/R

I = current

V = voltage

R = Resistance

The power source supplies a fixed voltage (V). Let the resistance of each light bulb be R.

When a light bulb is connected across voltage V, current I = V/R flows in the circuit.

When another bulb is added in series, the net resistance increases:

R' = R + R = 2 R

Because of increase in resistance, the current drawn in circuit decreases.

⇒ I' = V/2 R = I/2

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: