A) 8 times
B) 6 times
C) 4 times
D) 3 times
Correct Answer: C
Solution :
In circular motion centripetal force is necessary without it. Circular motion is not possible. Also, centripetal force is not a force, it depend on other force. Here Lorentz force provide necessary centripetal force for circular motion. \[qVB=\frac{m{{V}^{2}}}{r}\] \[r=\frac{mV}{qB}\] ...(i) [case-1] In another case\[r'=\frac{m\times 2V}{q\times \frac{B}{2}}=4r.\]. [Using equation (i)]
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