Voltage adds in a series and the amount of voltage dropped due to each resistor in a circuit (the light bulbs are resistors) depends on the resistance of each.
Assuming equal resistance of each light bulb, the voltage dropped on each is equal and should add up to 9V (Kirchoff's Rules).
So 9V/6 = 1.5V per light bulb.
Energy has dissipated into heat
Answer:
523.2 x 10^-7 T
Explanation:
distance between the two wires, D = 20 cm
d = D/2 = 10 cm = 0.1 m
Current in first wire, i1 = 25.6 A
Current in second wire, i2 = 5.4 A
The magnetic field due to a straight current carrying conductor is given by

Magnetic field due to the first wire

T
Magnetic field due to the second wire

T
The two magnetic field are perpendicular to each other
The resultant magnetic field is given by


B = 523.2 x 10^-7 T