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Shivam Kumar 1 year, 6 months ago

If a and b are the zeros of x 2x +3 find 1a + 1b- 2 ab
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Tauheed Hayat 1 year, 6 months ago

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Rumesha And Shahid 1 year, 6 months ago

It's simply given in formula of resistance that - R= row l/a L = length a = area This formula is representing that - R is directly proportional to length and inversely proportional to area of cross section. So , we get that if we the resistance is increased than cross section area will be decreased.

Upendra Bapat 1 year, 6 months ago

Resistance depends inversely on cross section area of wire. If cross section area increases, resistance decreases.
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Devanshi Dhaka 1 year, 6 months ago

Magnesium ribbon reacts with oxygen present in air to farm a protective and inert layer of magnesium oxide on its surface. This layer doesn't react and also prevents the ribbon from burning. Thus it have to be rubbed with sandpaper before burning so that the layer is removed😊
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Swati Gupta 1 year, 6 months ago

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Bhumika Singh 1 year, 6 months ago

This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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  • 4 answers

Nirdosh Shakya 1 year, 6 months ago

Magnesium ribbon reacts with oxygen in the atmosphere to form a layer of magnesium oxide which prevents it from burning.Thus, it is necessary to clean the magnesium ribbon with sand vapour before burning it

Ramita Jha 1 year, 6 months ago

A magnesium ribbon be clean before burning in air. It is because to remove the layer of magnesium carbonate .

Piyush Kuntal 1 year, 6 months ago

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Poorvaja Umashankar 1 year, 6 months ago

It contains the atmospheric oxygen before cleaning, and it becomes pure after rubbing it with the sand paper .

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