A-Level Physics Quiz

What is the definition of magnetic flux?

• The parallel component of magnetic flux density to an area.

• The total magnetic field passing through a surface.

• The perpendicular component of magnetic flux density to an area multiplied by the magnitude of that area.

• The rate of change of magnetic field with time.

According to Faraday's law, what condition is necessary for a constant induced EMF?

• A constant magnetic field.

• A constant rate of change of magnetic flux linkage.

• A constant electric current.

• A constant temperature.

How is the primary voltage in a transformer calculated?

• By adding the secondary voltage to the primary voltage.

• By multiplying the secondary voltage by the number of turns in the primary coil and dividing by the number of turns in the secondary coil.

• By dividing the secondary voltage by the number of turns in the primary coil.

• By subtracting the secondary voltage from the primary voltage.

Why does the potential difference across a lamp become zero after replacing an AC supply with a DC battery?

• Because the lamp is not compatible with DC.

• Because the battery is not connected properly.

• Because there is no change in magnetic flux with a DC supply.

• Because the battery has a lower voltage.

Which rule is used to determine the direction of force on ions in a magnetic field?

• Fleming's left-hand rule.

• Lenz's law.

• Fleming's right-hand rule.

• Ohm's law.

Why does the speed of ions remain unchanged in a magnetic field?

• Because the magnetic field is weak.

• Because the force is parallel to the velocity.

• Because the force is perpendicular to the velocity.

• Because the ions are not charged.

How is the magnetic force on an ion calculated in a mass spectrometer?

• Using the formula F = QVB.

• Using the formula F = MV^2 / R.

• Using the formula F = QV/R.

• Using the formula F = MV/R.

What does a smaller peak height in a detector's current variation indicate?

• A higher magnetic flux density.

• A lower number of charge carriers.

• A higher number of charge carriers.

• A lower magnetic flux density.

What does a smaller magnetic flux density at peak A suggest about the ions?

• The ions have a lower charge.

• The ions have a higher charge.

• The ions have a lower mass.

• The ions have a higher mass.

How is the number of ions reaching the detector per second calculated?

• By dividing the current by the elementary charge.

• By multiplying the current by the elementary charge.

• By adding the current to the elementary charge.

• By subtracting the current from the elementary charge.