Electromagnetism — Flashcards
ICSE · Class 10 · Physics
42 flashcards for Electromagnetism (ICSE Class 10 Physics) to test yourself on key terms and facts. Sample: "State Oersted's observation"
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See them allState Oersted's observation in electromagnetism.
Answer
Hans Oersted, in 1820 observed the production of magnetic field due to flow of electric current through a conducting wire. This showed that electric current has a magnetic effect.
Why does a compass needle deflect near a current-carrying wire?
Answer
A current-carrying wire produces a magnetic field around it. The compass needle responds to this field and deflects. When current increases, the magnetic field becomes stronger, so the deflection incr…
A wire carries current upward. Using the right hand thumb rule, how is the magnetic field direction found?
Answer
Hold the conductor in the right hand so that the thumb points in the direction of current. The encircled fingers show the direction of magnetic field around the wire. The field forms concentric circle…
State the right hand thumb rule.
Answer
According to right hand thumb rule, if we hold the current carrying conductor in our right hand such that the thumb points in the direction of current, fingers are encircled the wire in the direction …
A straight conductor carries 5 A current through a length of 0.4 m in a magnetic field of 2 T at right angles. Find the force on the conductor.
Answer
Given: i = 5 A, L = 0.4 m, B = 2 T, angle = 90°. Formula: F = IBL Step 1: Substitute values. F = 5 × 2 × 0.4 N Step 2: Multiply. F = 4 N Answer: 4 N Units check: A × T × m gives N.
State the formula for force on a current-carrying conductor when current, length, and magnetic field are perpendicular.
Answer
F = KiBL; F = IBL when length, current, and magnetic field are perpendicular. Here, F = force, I = current, B = magnetic field, and L = length. The force increases when current, field strength, or len…
State the SI unit of magnetic field and write its relation with force, current, and length.
Answer
B = F/(i·L) = newton(N)/(ampere(A) metre(m)) This unit is called tesla. It is also written as weber/m². Meaning: a magnetic field of 1 tesla produces 1 N force on a 1 m conductor carrying 1 A current …
Why does a current-carrying conductor experience force in a magnetic field?
Answer
A current is a flow of moving charges. A moving charge experiences force in a magnetic field, so a current-carrying conductor also experiences force. This force is called magnetic force or Lorentz for…
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