Expert Physics Tutoring

MS1:

- Magnets that retain their magnetic properties indefinitely (1)

- Produced by the alignment of magnetic domains within the material (1)

MS2:

- Electric current flowing through a coil of wire creates a magnetic field around it (1)

- When the current is switched off, the magnetic field disappears (1)

- Magnetic field strength can be increased by increasing the current or the number of turns in the coil (1)

MS3:

- Identifies Faraday's Law equation (1)

- Correctly substitutes values: -100(0.4 - 0.2)/0.1 (2)

- Final answer: 2 V (1)

MS4:

- When a material does not return to its original magnetic state after being magnetized and then demagnetized (1)

MS5:

- Convection currents in the Earth's liquid outer core (1)

- Movement of charged particles creates a magnetic field (1)

- Magnetic field is similar to a bar magnet, with north and south poles (1)

MS6:

- Soft iron (1)

MS7:

- Permanent magnet: Retains its magnetism indefinitely (1)

- Induced magnet: Only exhibits magnetism when in the presence of a magnetic field (1)

- Additional mark: Induced magnet loses magnetism when magnetic field is removed (1)

MS8:

- Magnetic flux density: Tesla (T) (1)

- Magnetic field strength: Amperes per metre (A/m) (1)

MS9:

- Identifies Biot-Savart's Law equation (1)

- Correctly substitutes values: (4π x 10^-7)(2 x 2)/0.2 (2)

- Final answer: 2π x 10^-6 T (1)

MS10:

- To protect objects from magnetic fields (1)

- Made of materials with high permeability and low retentivity (1)