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Plus Two Physics

What is the use of lithium in hydrogen bomb?

Muhafiz asked  – “What is the use of lithium in hydrogen bomb?” Lithium is the nuclear fuel for fusion bomb. Please refer to the following links https://en.wikipedia.org/wiki/Thermonuclear_weapon http://www.atomicarchive.com/Fusion/Fusion2.shtml

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Problems

Questions received through PlusTwoPhysics FeedBack form

Two point charges of 16 micro coulomb and -9 mC are placed 8cm apart in air.in which position the electric field become zero?and how we find this solution generally Asked aleena shyam particles of masses m¹=2g,m² =2g,m³=1g and m⁴=1g are placed at the corners of a square of side l, as shown. find the center of mass […]

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Plus Two Physics

How far an object should be placed from the pole of a concave mirror of focal length 20cm to form a real image whose size is 1/5 the size of the object.

The question was asked by jasleen Kaur Bhasin How far an object should be placed from the pole of a concave mirror of focal length 20 cm to form a real image whose size is 1/5 the size of the object? Can you answer this? Post the answers with necessary explanation a comment to this […]

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Plus Two Physics

How was Physics exam?

Students and teachers report that this year’s CBSE Physics exam was of a different kind and many questions were quite new. How did you feel? How was CBSE Physics exam 2017? Any genuine problem cited will help while finalising the marking scheme. So, report the problems which you faced. Students, teachers and parents can post […]

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+2 Physics Sample Papers

CBSE Physics Papers (Previous years)

CBSE Physics Papers (Previous years)  With the number of posts in the blog growing, I revisited the posts and decided to classify & club a number of similar posts in a single post. This would make the site user-friendly. The users will find it easier search the posts/topics they are looking for. This will facilitate learning […]

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Plus Two Physics

Change in length of rubber band on cooling

Some where i read that on cooling of rubber band it expands where as when heated it contracts . Why does it happen?Full description.please   Asked Bipin Kumar Answer The rubber band actually expands when it gets colder. This occurs because of the unusual polymer structure of rubber. When the long chains get hotter and vibrate, they […]

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Plus Two Physics

Prof. H.C. Verma | Mechanics Lecture #2

Prof. H.C. Verma | Mechanics Lecture #2 Takes things away: Centrifugal Force