Magnetism And Electromagnetism — Flashcards
Tamil Nadu Board · Class 9 · Science
25 flashcards for Magnetism And Electromagnetism (Tamil Nadu Board Class 9 Science) to test yourself on key terms and facts.
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What is a magnetic field and what does it represent?
Answer
A magnetic field is the region around a magnet where its magnetic influence can be felt. It is an invisible force field that extends around every magnet. It is denoted by the symbol B and measured in …
What are the properties of magnetic field lines?
Answer
Key properties of magnetic field lines are: (1) They are closed, continuous curves passing through the body of the magnet, (2) They start at the North Pole and end at the South Pole, (3) They never in…
A current-carrying wire of length 40 cm carrying 3 A is placed perpendicular to a magnetic field of 0.5 T. Calculate the force on the conductor.
Answer
Using the formula: F = ILB Given: I = 3 A, L = 40 cm = 0.4 m, B = 0.5 T F = 3 × 0.4 × 0.5 = 0.6 N The force on the conductor is 0.6 Newton. This force acts perpendicular to both the current direction …
State Fleming's Left Hand Rule and explain its application.
Answer
Fleming's Left Hand Rule states: Stretch the three fingers of your left hand (thumb, forefinger, and middle finger) perpendicular to each other. If the forefinger points in the direction of the magnet…
Why does a current-carrying conductor produce a magnetic field? Explain with the right-hand thumb rule.
Answer
A current-carrying conductor produces a magnetic field because moving electric charges (electrons) create magnetic effects. This was discovered by Hans Christian Oersted in 1820. The Right-Hand Thumb …
What happens when two parallel current-carrying wires carry current in the same direction versus opposite directions?
Answer
When two parallel wires carry current in the SAME DIRECTION: The wires ATTRACT each other. The magnetic field of one wire attracts the other wire, pulling them closer together. This happens because th…
Describe Hans Christian Oersted's experiment and what it demonstrated.
Answer
In 1820, Oersted aligned a wire along the North-South direction with compasses placed above and below it. When the circuit was open (no current), both compasses pointed North. When current flowed thro…
What is an electric motor and how does the rotating coil produce motion?
Answer
An electric motor is a device that converts electrical energy into mechanical energy. It works using the principle that a current-carrying conductor in a magnetic field experiences a force. How it wo…
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