Magnetic Fields (GCSE Physics)

Which equation links the turns ratio (Ns/Np) to the voltage ratio (Vs/Vp) in an ideal transformer?

What is the unit of magnetic flux density (B)?

Which change will increase the magnetic field strength inside a solenoid?

Which arrangement will produce the strongest magnetic field outside a bar magnet?

What is the equation linking force (F), magnetic flux density (B), current (I) and length of wire (L) in a uniform magnetic field perpendicular to the wire?

A changing magnetic flux through a coil induces an emf. Which of these will NOT increase the induced emf in a coil?

When a coil in a magnetic field is rotated, the induced emf changes sign every half turn. Which type of current does the coil alone produce (before a commutator)?

What is the main reason step-up transformers are used at power stations before transmission along overhead lines?

Which material makes the best core for an electromagnet used in a transformer to increase magnetic field strength?

Which property makes soft iron a suitable core for electromagnets used in transformers and relays?

In a transformer, if the primary coil has 1000 turns and the secondary coil has 5000 turns, how does the secondary voltage compare to the primary?