Verified Solution • 2025–26 Session moderate

QPages 230-234: Q46: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Pages 230-234: Q46 Solution: A uniform magnetic field of magnitude 0.20 T exists in space…

A uniform magnetic field of magnitude 0.20 T exists in space from east to west. With what speed should a particle of mass 0.010 g and with charge 1.0×10−5 C1.0 \times 10^{-5} \text{ C} be projected from south to north so that it moves with uniform velocity?

Step-by-Step Verified Solution

**Answer:** v=9800 m/sv = 9800 \text{ m/s}. **Step-BY-Step Explanation:** For uniform velocity, the magnetic force must balance the gravitational force: qvB=mgq v B = m g. v=mgqB=0.01×9.81.0×10−5×0.20=49000 m/sv = \frac{m g}{q B} = \frac{0.01 \times 9.8}{1.0 \times 10^{-5} \times 0.20} = 49000 \text{ m/s}.

All Questions in this Chapter

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