7 Questions
What is the unit of electromotive force?
(N ⋅ A ⋅ m) (J)
What phenomena is related to generated current (s) when a piece of conductor moves through a magnetic field?
Lenz’s law
The induced current always tends to oppose the cause which produces it.
True
According to Lenz law, what is the direction of the induced current and the induced magnetic field in the following cases?
The induced current always flows in a direction that opposes the change in magnetic flux that induced it. The induced magnetic field is in a direction that reinforces the original magnetic field.
The RMS voltage of an AC household outlet is ______. What is the maximum voltage across a lamp connected to the outlet?
145 V
You move a straight wire that is 0.5 m long at a speed of 20 m/s vertically through a 0.4 T magnetic field pointed in the horizontal direction. What is the EMF induced in the wire?
4 V
At what speed would a 0.2 m length of wire have to move across a 2.5 T magnetic field to induce an EMF of 10 V?
20 m/s
Study Notes
EOT - Grade 10 Adv - 2023-2024
- The unit of electromotive force (EMF) is Volt (V).
- The dimensional analysis for the calculation of EMF is J/C (Joule per Coulomb).
Electromagnetic Induction
- When a piece of conductor moves through a magnetic field, it generates a current, known as induced current.
- The induced current always tends to oppose the cause that produces it, according to Lenz's law.
Lenz's Law
- Lenz's law states that the induced current always tries to counteract the change that caused it.
- The direction of the induced current and magnetic field can be determined using Lenz's law.
Power and Voltage
- The peak power is the maximum power used by an appliance, while the average power is the power used over a period of time.
- The effective voltage is the root mean square (RMS) voltage, which is the voltage used to calculate the power consumed by an appliance.
Electromagnetic Force (EMF)
- EMF is induced in a wire when it moves through a magnetic field.
- The EMF induced in a wire depends on the speed of the wire, the length of the wire, and the strength of the magnetic field.
Right-Hand Rule
- The right-hand rule is a method used to determine the direction of the magnetic field, the direction of the force, and the direction of the current.
Practice questions and exercises on electricity and magnetism for Grade 10 Advanced students. Assess your understanding of currents and electric circuits.
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