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Electric Charges and Fields
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Electric Charges and Fields
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25 Questions

1. The structure of solids is investigated by using
2. An electric dipole - consisting of two oppositecharges of 2 × 10 -“6 C each separated by a distance 3 cmis placed in an electric field of 2 × 10 5 N/CTorque actingon the dipole is [1995]
3. The ratio of amplitude of magnetic field to theamplitude of electric field for an electromagnetic wavepropagating in vacuum is equal to: [2012M]
4. A signal emitted by an antenna from a certain pointcan be received at another point of the surface in theform of [1993]
5. There is an electric field E in x-directionIf the workdone on moving a charge of 0.2 C through a distance of 2m along a line making an angle 60° with x-axis is 4J - thenwhat is the value of E? [1995]
6. If E and B represent electric and magnetic fieldvectors of the electromagnetic waves - then the directionof propagation of the waves will be along [2002]
7. Which of the following is positively charged?
8. The mean free path of electrons in a metal is 4 ×10-“8 mThe electric field which can give on an average 2eV energy to an electron in the metal will be in units ofV/m [2009]
9. Two positive ions - each carrying a charge q - areseparated by a distance dIf F is the force of repulsionbetween the ions - the number of electrons missing fromeach ion will be (e being the charge of an electron)[2010]
10. An electric dipole of moment ´p´ is placed in anelectric field of intensity ´E´The dipole acquires aposition such that the axis of the dipole makes an angle θwith the direction of the fieldAssuming that thepotential energy of the dipole to be zero when = 90° - thetorque and the potential energy of the dipole willrespectively be: [2012]
11. Which one of the following rays is notelectromagnetic wave? [2003]
12. An electric dipole of dipole moment p is alignedparallel to a uniform electric field EThe energy requiredto rotate the dipole by 90° is [NEETKar2013]
13. A point Q lies on the perpendicular bisector of anelectrical dipole of dipole moment pIf the distance of Qfrom the dipole is r (much larger than the size of thedipole) - then the electric field at Q is proportional to[1998]
14. Which of the following electromagnetic radiationshas the least wavelength? [2002]
15. Two metallic spheres of radii 1 cm and 3 cm aregiven charges of -“1 × 10-“2 C and 5 × 10-“2 C - respectively.If these are connected by a conducting wire - the finalcharge on the bigger sphere is: [2012M]
16. The electromagnetic radiations are caused by
17. The formation of a dipole is due to two equal anddissimilar point charges placed at a [1996]
18. The electric potential V at any point (x - y - z) - all inmeters in space is given by V= 4x 2 voltThe electric fieldat the point (1 - 0 - 2) in volt/meter is [2011M]
19. The electric and magnetic field of anelectromagnetic wave are [2007]
20. Point charges + 4q - -“q and +4q are kept on the Xaxis at points x =0 - x =a and x = 2a respectively[1988]
21. The electric intensity due to a dipole of length 10cm and having a charge of 500 μC - at a point on the axisat a distance 20 cm from one of the charges in air - is[2001]
22. The frequencies of X-rays - γ -rays and ultravioletrays are respectively a - b - and cThen [2000]
23. A particle of mass m and charge q is placed at restin a uniform electric field E and then releasedThekinetic energy attained by the particle after moving adistance y is [1998]
24. The oscillating electric and magnetic field vectors ofelectromagnetic wave are oriented along
25. When air is replaced by a dielectric medium offorce constant K - the maximum force of attractionbetween two charges - separated by a distance [1999]

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