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Physics Assertions Explained

The document presents a series of assertions and reasons related to concepts in electromagnetism, specifically focusing on alternating current, Faraday's law of electromagnetic induction, and Lenz's Law. Each assertion is evaluated for its truthfulness and whether the reason provided correctly explains it. The conclusions indicate that while some assertions and reasons are both true, others have false reasons despite true assertions.

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3 views2 pages

Physics Assertions Explained

The document presents a series of assertions and reasons related to concepts in electromagnetism, specifically focusing on alternating current, Faraday's law of electromagnetic induction, and Lenz's Law. Each assertion is evaluated for its truthfulness and whether the reason provided correctly explains it. The conclusions indicate that while some assertions and reasons are both true, others have false reasons despite true assertions.

Uploaded by

yasharchit23
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Q13.

Assertion (A): An alternating current of frequency 50Hz becomes zero, 100 times in
one second.

● Reason (R): Alternating current changes direction and becomes zero twice in a
cycle.

Answer:

● A is true because for a 50Hz AC, the current changes direction 50 times per second.
Since it becomes zero twice in each cycle (once when it changes direction), it
becomes zero 100 times per second.
● R is true, and it correctly explains the assertion.

Hence, (A) and (R) are both true, and (R) is the correct explanation of (A).

Q14. Assertion (A): Faraday established induced EMF experimentally.

● Reason (R): Magnetic flux can produce an induced EMF.

Answer:

● A is true as Faraday's experiments led to the discovery of electromagnetic induction.


● R is true because changing magnetic flux produces induced EMF, according to
Faraday's law.
● R explains A.

Hence, (A) and (R) are both true, and (R) is the correct explanation of (A).

Q15. Assertion (A): The direction of induced EMF is always such as to oppose the changes
that cause it.

● Reason (R): The direction of induced EMF is given by Lenz's Law.

Answer:

● A is true because Lenz's Law states that the induced EMF opposes the change in
magnetic flux that causes it.
● R is true and explains A as Lenz's law dictates this behavior.

Hence, (A) and (R) are both true, and (R) is the correct explanation of (A).

Q16. Assertion (A): Only a change of magnetic flux will maintain an induced current in the
coil.
● Reason (R): The presence of large magnetic flux will maintain an induced current in
the coil.

Answer:

● A is true because an induced current can only be sustained by a changing magnetic


flux, according to Faraday’s law.
● R is false because merely the presence of magnetic flux, no matter how large, won't
maintain a current. It is the change in flux that induces current.

Hence, (A) is true, but (R) is false.

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