Advertisements
Advertisements
प्रश्न
The magnitude of the electric field due to a point charge object at a distance of 4.0 m is 9 N/C. From the same charged object the electric field of magnitude, 16 N/C will be at a distance of ______.
पर्याय
1 m
2 m
3 m
6 m
Advertisements
उत्तर
The magnitude of the electric field due to a point charge object at a distance of 4.0 m is 9 N/C. From the same charged object the electric field of magnitude, 16 N/C will be at a distance of 3 m.
Explanation:
We know that,
E = `(kq)/r^2`
Where E is the magnitude of the electric field, k is constant, q is a charge of magnitude and r is the distance away from the point charge.
Given: E1 = 9 N/C, r1 = 4 and k = `9 xx 10^9` Nm2/C2, E2 = 16 N/C and q is same for both objects.
To find: r2
`E_1 = (kq)/r_1^2`
`9 = ((9 xx 10^9 xx q))/4^2`
`q = ((9 xx 16))/((9 xx 10^9))`
q = 16 × 10-9
`E_2 = (kq)/r_2^2`
`16 = ((9 xx 10^9 xx 16 xx 10^-9))/r_2^2`
`r_2^2 = 9`
`r_2 = 3` m
संबंधित प्रश्न
Why do the electrostatic field lines not form closed loops?
Why do the electric field lines never cross each other?
Which among the curves shown in the fig. cannot possibly represent electrostatic field lines?
(a)
(b)
(c)
(d)
(e)
The figure shows the field lines on a positive charge. Is the work done by the field in moving a small positive charge from Q to P positive or negative? Give reason.
A thin, metallic spherical shell contains a charge Q on it. A point charge q is placed at the centre of the shell and another charge q1 is placed outside it as shown in the following figure. All the three charges are positive. The force on the central charge due to the shell is ______.
The intensity of the electric field at a perpendicular distance of 0·5 m from an infinitely long line charge having linear charge density (λ) is 3-6 × 103 Vm-1. Find the value of λ.
Explain why two field lines never cross each other at any point?
Figure shows electric field lines in which an electric dipole P is placed as shown. Which of the following statements is correct?
If Ea be the electric field strength of a short dipole at a point on its axial line and Ee that on the equatorial line at the same distance, then:
Figure shows the electric field lines around three point charges A, B and C.
- Which charges are positive?
- Which charge has the largest magnitude? Why?
- In which region or regions of the picture could the electric field be zero? Justify your answer.
(i) near A, (ii) near B, (iii) near C, (iv) nowhere.
