Home
Class 12
PHYSICS
The mass of an electron is 9.11 x 10^-31...

The mass of an electron is `9.11 x 10^-31` kg, that of a proton is `1.67 x 10^-27` kg. Find the ratio `F_e// F_g` of the electric force and the gravitational force exerted by the proton on the electron.-

Text Solution

Verified by Experts

The correct Answer is:
A, B, C
`F_e=1/(4piepsilon_0)(q_1q_2)/r^2`
`and F_g=G(m_1m_2)/r^2`
`:. F_e/F_g=((1//4piepsilon_0)q_1q_2)/(Gm_1m_2)`
`=((9xx10^+9)(1.6xx0^-19)^2)/((6.67xx10^-11)(9.11xx10^-31)(1.67xx10^-27))`
`=2.27xx10^39`
Promotional Banner

Topper's Solved these Questions

  • ELECTROSTATICS

    DC PANDEY|Exercise Exercise 24.3|5 Videos

  • ELECTROSTATICS

    DC PANDEY|Exercise Exercise 24.4|4 Videos

  • ELECTROSTATICS

    DC PANDEY|Exercise Exercise 24.1|4 Videos

  • ELECTROSTATIC POTENTIAL AND CAPACITORS

    DC PANDEY|Exercise (C) Chapter exercises|50 Videos

  • GRAVITATION

    DC PANDEY|Exercise All Questions|120 Videos

Similar Questions

Explore conceptually related problems

Find the ratio of the electric and gravitational forces between two protons.

If mass of an electron is 9.1xx10^(-31) kg, the number of electrons in 1 mg is

If mass of an electron is 9.11xx10^(-31) kg, how many electrons will weight 2 kg?

The mass of an electron is 9.11xx10^(-31)kg . How many elecrons would make 1kg?

The rest mass of an electron is 9.11xx10^(-31) kg. Molar mass of the electron is

The ratio of magnitude of electrostatic force and gravitational force for an electron and a proton is

The mass of an electron is 9.1xx10^(-31)kg . If its K.E. is 3.0xx10^(-25) J , calculate its wavelength

How many protons weight 5kg? The mass of a proton is 1.67xx10^(-27)kg .

Knowledge Check

  • If mass of an electron is 9.1xx10^(-31) kg, the number of electrons in 1 mg is

    A
    `1.09xx10^(27)`
    B
    `1.09xx10^(24)`
    C
    `9.1xx10^(28)`
    D
    `9.1xx10^(31)`

  • The rest mass of an electron is 9.11xx10^(-31) kg. Molar mass of the electron is

    A
    `1.5xx10^(-31) kg mol^(-1)`
    B
    `9.11xx10^(-31) kg mol^(-1)`
    C
    `5.5xx10^(-7) kg mol^(-1)`
    D
    `6.02xx10^(23) kg mol^(-1)`

  • The ratio of magnitude of electrostatic force and gravitational force for an electron and a proton is

    A
    `6.6xx10^(39)`
    B
    `2.4xx10^(39)`
    C
    `6.6xx10^(29)`
    D
    `2.4xx10^(29)`