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Electric Charges and Fields · Question 28

AIPMT 2006MCQEasy📈 Topic in 0% papers+4−1
1

A square surface of side L metres is in the plane of the paper. A uniform electric field E (volt/m), also in the plane of the paper is limited only to the lower half of the square surface (see figure). The electric flux in SI units associated with the surface is [figure]

  1. EL2
  2. EL2/2 0
  3. EL2/2
  4. zero

Answer

(4) zero

Solution

As per NCERT, electric flux through a surface: = E S = E S

The area vector of the square is normal to the plane of the paper, while E lies in the plane of the paper.

= 90 , 90 = 0

= 0 (no field line crosses the surface; this holds whatever part of the square the field covers).

Answer: (4)

AIPMT 2006

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2

The unit of permittivity of free space, 0, is

  1. coulomb/newton-metre
  2. newton-metre2/coulomb2
  3. coulomb2/newton-metre2
  4. coulomb2/(newton-metre)2
AIPMT 2004
3

A charge q is located at the centre of a cube. The electric flux through any face is

  1. 2 q6(4 0)
  2. 4 q6(4 0)
  3. q6(4 0)
  4. q6(4 0)
AIPMT 2003
4

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The Coulomb force F between the two is

  1. K e2r2 r
  2. -K e2r3 r
  3. K e2r3 r
  4. -K e2r2 r
AIPMT 2003
5

A dipole of dipole moment p is placed in uniform electric field E then torque acting on it is given by

  1. = p E
  2. = p E
  3. = p + E
  4. = p - E
AIPMT 2001
6

A charge Q is placed at the centre of a cube, the flux coming out from each face will be

  1. Q6 0 10-6
  2. Q6 0 10-3
  3. Q24 0
  4. Q8 0
AIPMT 2001
7

A charge Q is situated at the corner of a cube, the electric flux passed through all the six faces of the cube is

  1. Q6 0
  2. Q8 0
  3. Q 0
  4. Q2 0
AIPMT 2000
8

Electric field at centre O of semicircle of radius a having linear charge density is given as [figure]

  1. 2 0 a
  2. 0 a
  3. 2 0 a
  4. 0 a
AIPMT 2000

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