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BITSAT 2012
Exam
BITSAT
Year
2012
Subject
Physics
Chapter
Electrostatics

BITSAT 2012 · Physics · Electrostatics

The electric field intensity just sufficient to balance the earth's...

The electric field intensity just sufficient to balance the earth's gravitational attraction on an electron will be: (given mass and charge of an electron respectively are 9.1×10−31kgand9.1 \times 10^{-31} \mathrm{ kg} and1.6 \times \left.10^{-19} \mathrm{C}.\right)

Options

  1. A−5.6×10−11N/C-5.6 \times 10^{-11} \mathrm{ N} / \mathrm{C}
  2. B−4.8×10−15N/C-4.8 \times 10^{-15} \mathrm{ N} / \mathrm{C}
  3. C−1.6×10−19N/C-1.6 \times 10^{-19} \mathrm{ N} / \mathrm{C}
  4. D−3.2×10−19N/C-3.2 \times 10^{-19} \mathrm{ N} / \mathrm{C}

Correct answer

A. −5.6×10−11N/C-5.6 \times 10^{-11} \mathrm{ N} / \mathrm{C}

Step-by-step solution

−-\mathrm{eE}=\mathrm{mg}E→=−9.1×10−31×101.6×10−19=−5.6×10−11N/C\overrightarrow{\mathrm{E}}=-\frac{9.1 \times 10^{-31} \times 10}{1.6 \times 10^{-19}}=-5.6 \times 10^{-11} \mathrm{ N} / \mathrm{C}
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