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Magnetic Effects of Electric Current — Science STD 10 — Question

Maharashtra BoardEnglish MediumSTD 10ScienceMagnetic Effects of Electric Current1 Mark
MCQ
A magnetic field exerts no force on:
  • A
    An electrical charge moving perpendicular to its direction$...$
  • B
    An unmagnetised iron bar.
  • ✓
    A stationary electric charge.
  • D
    A magnet.
✓

Answer

Correct option: C.
A stationary electric charge.
Magnetic force is given by Lorentz equation as:
$F = q(v \times B)$
Here, $q =$ amount of electric charge, $v =$ velocity of charge and $B =$ magnetic flux
Thus, when velocity of charge​ $(v) = 0,$​​​​​​​ magnetic force $(F) = 0$

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