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Electric Charges and Fields
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Avg score: 66% • Most missed: “Which of the following is positively charged?”
Electric Charges and Fields
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25 Questions

1. The ratio of amplitude of magnetic field to theamplitude of electric field for an electromagnetic wavepropagating in vacuum is equal to: [2012M]
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 electric and magnetic field of anelectromagnetic wave are [2007]
4. If E and B represent electric and magnetic fieldvectors of the electromagnetic waves - then the directionof propagation of the waves will be along [2002]
5. Which one of the following rays is notelectromagnetic wave? [2003]
6. The electric and magnetic field of anelectromagnetic wave are [2007]
7. When air is replaced by a dielectric medium offorce constant K - the maximum force of attractionbetween two charges - separated by a distance [1999]
8. 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]
9. 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]
10. 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]
11. When air is replaced by a dielectric medium offorce constant K - the maximum force of attractionbetween two charges - separated by a distance [1999]
12. 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]
13. A signal emitted by an antenna from a certain pointcan be received at another point of the surface in theform of [1993]
14. 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]
15. 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]
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. A hollow insulated conduction sphere is given apositive charge of 10 PCWhat will be the electric field atthe centre of the sphere if its radius is 2 metres? [1998]
19. Which of the following is positively charged?
20. 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]
21. 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]
22. Which of the following is positively charged?
23. If E and B represent electric and magnetic fieldvectors of the electromagnetic waves - then the directionof propagation of the waves will be along [2002]
24. 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]
25. The frequencies of X-rays - γ -rays and ultravioletrays are respectively a - b - and cThen [2000]

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