Page 3 - English Class X_cbse new (FINAL).cdr

TOPIC - 1

Coulomb’s law

Sub Topic: 1.1

QUESTION SOLUTION Marking TIPS & EXPLANATION

The sum of two point charges is 7μC. They repel CHAPTER-1Let one of two charges is x μC. Therefore, other Scheme Tips: q1 q2
each other with a force of 1N when kept 30cm apart r2
in free space. Calculate the value of each charge. charge will be (7– x) μC. F = 1
4πεo
By Coulomb's law, INTRODUCTION [1]
1 q1 q2
DEMO [2] Delhi Set-1 [2009] F = 4πεo r2

QUESTION Marking
Scheme
( )Define microeconomics.
[1]
Or [1] Outside Delhi Set-1 2012
1SMu=nOiciLt9rUos×ueT1ccI0Oho9Nna×osmxhi×cos1u0sise-6h(s(o0tu7l.d3d−sy)2,xoi)nf×din1ud0sit−vr6iiedsu.ael tecc.onomic TIPS & EXPLANATION
Tips:
9 × 10-2 = 9 × 109-12 (7 – x) The word 'micro' means small.

Give the meaning of micro-economics. 10 = x (7 – x) × x Explanation:
[1] Delhi set 3 2009 x – 7x + 10 = 0
Microeconomics is the study of individuals, households
Tick: How do you find this question? (x – 2) (x – 5) = 0 and firms' behavior in decision making and allocation of
x = 2 μC or 5 μC [1] resources. It generally applies to markets of goods and
services and deals with individual and economic issues
[2]
Easy V. Difficult Therefore, charges are 2 μC and 5 μC.

Q11 . FAouurnpifooirnmt chhaalrfgmesetQre, rqu,leQbaanladnqceasrehpolraizcoendtaaltlythoencaorknneifres eodf gaesqaut a2r9ecomf mark 1. A uniform half metre rule balances horizontally on a knife edge at 29 cm mark
swidhee'na'aaswsehigohwt nofin2t0hegffiigsusrues. pended from one end. when a weight of 20 gf is suspended from one end.

Qq (i) Draw a diagram of the arrangement.
(i) Draw a diagram of the arrangement.

(ii) What is the weight of half metre rule? (ii) What is the weight of half metre rule?

[1] [Delhi set 1] 2012 [1] [Delhi set 1] 2012

2. A uniform half metre rule balances horizontally on a knife edge at 29 cm mark 2. A uniform half metre rule balances horizontally on a knife edge at 29 cm mark
when a weight of 20 gf is suspended from one end. when a weight of 20 gf is suspended from one end.

(i) Draw a dthiaegwraemighotfqtohfehaarlframnegteremareunlet.? Q (b) Find(io)utDthraewama oduiangt roafmthoefwthoerkadrroannegetomseenpt.arate the charges at infinite dis
(ii) What is tanc(eii.) What is the weight of half metre rule?

Find the [1] [Delhi set 1] 2012 [1] [[D3]eOlhDi[2s0e1t81] ] 2012

(a) resultant electric force on a charge Q, and

(b) 3. pAoteunntiifaolrmenhearglfymoef ttrheisruslyestbeamla.nces horizontally on a knife edge at 29 cm mark Q2 3W. haAt uisnitfhoermforhcaelfbmeetwtreeernultewobaslmanacllecshhaorgriezsonotfa2lly×o1n0a-7 Cknaifnede3dg×e1a0t-72C9 cm mark
when a weight of 20 gf is suspenOdeRd from one end. placwehde3n0acmweaigphatrtoifn2a0irg?f is suspended from one end.

Three p(io)intDcrhaawrgaedsiaqg, r–a4mq aonf dth2eqaarrraenpgleamceednat.t the vertices of an equilateral trian- (i) Draw a diagram of the arrangement. [2] OD Set-1 [2014]

gle ABC(ii)of Wsidheat'li'satshsehwoweinghint othf ehafilgf umree.trOebrtualien?the expression for the magnitude (ii) What is the weight of half metre rule?

of the resultant electric force acting on the charge q. [1] [Delhi set 1] 2012 [1] [Delhi set 1] 2012

4. A uniform half metre rule balances horizontally on a knife edge at 29 cm mark 1
whenPhysics Booklet_Unit 1_.indd 1 a weight of 20 gf is suspended from one end. 4. A uniform half metre rule balances horizontally on a knife edge at 29 cm mark

when a weight of 20 gf is suspended from one end. 8/17/2018 8:35:07 AM