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प्रश्न
Define electric flux.
Define electric flux. Is it a scalar or a vector quantity?
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उत्तर १
Electric flux is the total number of lines of force passing through the unit area of a surface held perpendicularly.
Electric flux ΔΦ through an area element ΔS is given by
ΔΦ = E.ΔS = EΔScosθ
θ is the angle between E and ΔS.
उत्तर २
Electric flux is defined as the number of electric field lines crossing the per unit area. It is given as
`triangle phi = vecE.vec(triangleS) cos theta`
where `vecE` is Electric field and `vec(triangleS)`is area vector. The angle θ here is the angle between `vecE` and `vec(triangle S)`.
Since Electric flux is the dot product of two vectors, Hence it is a Scalar quantity.
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संबंधित प्रश्न
What is the electric flux through a cube of side 1 cm which encloses an electric dipole?
Careful measurement of the electric field at the surface of a black box indicates that the net outward flux through the surface of the box is 8.0 × 103 N m2/C.
- What is the net charge inside the box?
- If the net outward flux through the surface of the box were zero, could you conclude that there were no charges inside the box? Why or Why not?
A small plane area is rotated in an electric field. In which orientation of the area, is the flux of the electric field through the area maximum? In which orientation is it zero?
If the flux of the electric field through a closed surface is zero,
(a) the electric field must be zero everywhere on the surface
(b) the electric field may be zero everywhere on the surface
(c) the charge inside the surface must be zero
(d) the charge in the vicinity of the surface must be zero
The electric field in a region is given by `vec"E"` = 5 `hatk`N/C. Calculate the electric flux Through a square of side 10.0 cm in the following cases
- The square is along the XY plane
- The square is along XZ plane
- The normal to the square makes an angle of 45° with the Z axis.
A charge 'Q' µC is placed at the centre of a cube. The flux through one face and two opposite faces of the cube is respectively ______.
The total flux through the faces of the cube with side of length a if a charge q is placed at corner A of the cube is ______.
What will be the total flux through the faces of the cube (figure) with side of length a if a charge q is placed at
- A: a corner of the cube.
- B: mid-point of an edge of the cube.
- C: centre of a face of the cube.
- D: mid-point of B and C.
