Magnetic Fields (GCSE Physics)

A straight horizontal wire carries current to the right and is placed in a uniform magnetic field directed into the page. Using Fleming’s left-hand rule, the force on the wire will be:

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

Which of the following shows the direction of force on a current-carrying wire in a magnetic field (motor effect) using Fleming’s left-hand rule?

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

When is the magnetic flux through a coil changing most rapidly as a magnet is pushed into it?

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 solenoid (long coil) with current flowing through it behaves like:

Why is a laminated iron core used in large transformers rather than a single solid block of iron?

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

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)?