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# Assertion :A uniformly charged disc has a pin hole at its centre. The electric field at the centre of the disc is zero Reason: Disc can be supported to be made up of many rings. also electric field at the centre of uniformly charged ring is zeroBoth Assertion and Reason are correct and Reason is the correct explanation for AssertionBoth Assertion and Reason are correct but Reason is not the correct explanation for AssertionAssertion is correct but Reason is incorrectAssertion is incorrect but Reason is correct

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C
Assertion is correct but Reason is incorrect
D
Assertion is incorrect but Reason is correct
Solution
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#### The electric field due to disc is superposition of electric field due to its constituent ring as given in statement-2.Statement 1 is true, statement-2 is true, statement-2 is a correct explanation of statement-1.

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Similar Questions
Q1
Assertion :A uniformly charged disc has a pin hole at its centre. The electric field at the centre of the disc is zero Reason: Disc can be supported to be made up of many rings. also electric field at the centre of uniformly charged ring is zero
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Q2
Assertion :
A uniformly charged disc has a pin hole at its centre. The electric field at the centre of the disc is zero.

Reason :
Disc can be supposed to be made up of many rings. also electric field at the centre of uniformly charged ring is zero.
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Q3
Assertion: The compressibility factor for H2​ and He is (1+PbRT)
Reason: The compressibility factor for H2​ and He can be derived from Van der Waal's equation.
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Q4

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Q5

Assertion: Be and Al have similar properties.

Reason: Be2+ and Al3+ have nearly the same charge/volume ratios and similar polarising power.

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