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Question

A proton in a uniform electric field moves along a straight line with constant acceleration starting from rest. If it attains a velocity 4×103 km/s at a distance of 2cm, the time required to reach the given velocity is :
  1. 108s
  2. 105s
  3. 103s
  4. 106s

A
105s
B
108s
C
103s
D
106s
Solution
Verified by Toppr

v2=u2+2as
u=0,s=2×102mt
a=v22s=(4×103×103)22×2×102m/s2
a=4×1014

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