The diagram shows a step-up transformer used to transmit
clectricity. The secondary coil
has 16 times more turns on it
than the primary coil.

The voltage across the primary coil is 25 000 V

Calculate the voltage across the secondary coil

Iam on that question know can you tell me the answer i am realy strruglingasap

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current

Answerapplying a direct current to a non magnetic material in order to create a electromagnetic field; plz check first good luck;