Introduction: This question deals with the concept of induced charge and the difference in behavior of copper and aluminum conductors in an electric field.

Induced charge: When a conductor is placed in an electric field, the charges in the conductor experience a force due to the electric field. This force causes the charges to move within the conductor. The movement of charges results in the accumulation of charges at one end of the conductor and the depletion of charges at the other end. This accumulation and depletion of charges are known as induced charges.

Behavior of copper and aluminum conductors: Copper and aluminum are both good conductors of electricity. However, copper has a higher conductivity than aluminum. This means that copper can conduct electricity better than aluminum.

Effect of conductivity on induced charge: The magnitude of induced charge depends on the conductivity of the conductor. A conductor with high conductivity will have a higher magnitude of induced charge than a conductor with low conductivity. This is because a conductor with high conductivity can conduct the charges more easily than a conductor with low conductivity.

Conclusion: In conclusion, the magnitude of induced charge in aluminum will be lower than that in copper. This is because copper has a higher conductivity than aluminum, which allows it to conduct the charges more easily and accumulate larger induced charges.