Question
For two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.
  1. Both A and R are true, and R is the correct explanation of A.
  2. Both A and R are true, but R is not the correct explanation of A.
  3. A is true but R is false.
  4. A is false and R is also false.
Assertion (A): A point charge is brought in an electric field. The field at a nearby point is increase, whatever be the nature of the charge.
Reason (R): The electric field is independent of the nature of charge.

Answer

  1. A is false and R is also false.

Explanation:

Electric field at the nearby point will be resultant of existing field and field due to the charge brought. lt may increase or decrease if the charge is positive or negative depending on the position of the point with respect to the charge brought.

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Two statements are given-one labelled Assertion(A) and the other labelled Reason (R). Select the correct answer to these questions from the codes(a), (b), (c) and (d) as given below.
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Assertion (A): There is only one neutral points on a horizontal board when a magnet is held vertically on the board.
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For question two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.

  1. Both A and R are true, and R is the correct explanation of A.
  2. Both A and R are true, but R is NOT the correct explanation of A.
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Assertion (A): The positively charged nucleus of an atom has a radius of almost 10-15m.

Reason (R): In $\alpha$-particle scattering experiment, the distance of closest approach for $\alpha$-particles is 10-15m.

Two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b ), (c) and (d) as given below.
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  2. Both A and Rare true but R is NOT the correct explanation of A.
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Assertion (A): An artificial satellite with a metal surface is moving above the earth in a circular orbit. A current will be induced in satellite if the plane of the orbit is inclined to the plane of the equator.
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Assertion: The probability of electrons to be found in the conduction band of an intrinsic semiconductor at a finite temperature decrease exponentially with increasing band gap.
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Assertion (A): Charging is due to transfer of electrons.
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Reason (R): The cellophane paper decreases the wavelength of light.
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Assertion: We use a thick wire in the secondary coil ofa step down transformer to reduce the production of heat.
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For question two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.
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  2. Both A and R are true, but R is NOT the correct explanation of A.
  3. A is true, but R is false.
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Assertion (A): Smoky flame of Bunsen burner gives continuous spectrum whereas its blue flame gives band spectrum.
Reason (R): The band spectrum consists of coloured bands of light on a dark background.