Moving Charges and Magnetism
Telangana Open School (TOSS) · Class 12 · Physics
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Quick Quiz: Moving Charges and Magnetism
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Who discovered the magnetic effect of electric current?
What is the direction of the magnetic field around a straight current-carrying wire?
Which rule gives the direction of the magnetic field due to a current-carrying conductor?
The SI unit of magnetic field is:
Sample Questions
What happens to the compass needle when current flows through a nearby wire?
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It deflects
A current-carrying wire produces a magnetic field, which exerts a force on the magnetic compass needle, causing it to deflect.
The magnetic field at the center of a circular coil is directly proportional to:
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Current and number of turns
The magnetic field at the center of a circular coil is given by \( B = rac{\mu_0 nI}{2r} \), so it depends on current (I) and number of turns (n).
The magnetic field due to a long straight wire decreases with distance as:
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1/r
The magnetic field due to a long straight current-carrying wire is \( B = rac{\mu_0 I}{2\pi r} \), which is inversely proportional to the distance (r).
Ampere’s circuital law relates the line integral of magnetic field to:
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Current enclosed
Ampere’s circuital law states that the line integral of B around a closed loop is equal to μ₀ times the current enclosed by the loop.
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