A power station generates electricity at 25,000 V, which is then stepped up to 500,000 V using a transformer for efficient transmission. If the primary coil has 200 turns, how many turns does the secondary coil have?

Problem 2) A circuit contains three resistors with values of 5 ohms, 10 ohms, and 15 ohms, connected in parallel to a 12V battery. Calculate the total resistance and the current flowing through the circuit.

Problem 3) A 200-turn coil has an area of 0.02 m2 and is placed in a magnetic field of 0.5 T. Calculate the magnetic flux through the coil when it is oriented perpendicular to the magnetic field.