Page 6 - English Class X_cbse new (FINAL).cdr

(b) Tips: (b)

+++++ + + +++ Electric field any point due charge q E= 1 q
4πεo r2
r++++ +
Explanation:
+
++ ++ Electric field will be maximum when radius a = r (means
Emax
at surface of sphere 'E' will be maximum)

When distance 'r' increases E reduces exponentially

since E ∝ 1
r2

r Tips: (c)

• Electric field inside conductor = o [1] Torque is force that tends to cause rotation.

• At Surface of conductor electric field is maximum. τ = Force × perpendicular distance between two force.

• Where r >> a, E reduces exponentially.

(c) When dipole kept in uniform electric field

it experience a torque force which tries to

move it in equilibrium state,

Torque on dipole can be give as,

Explanation:

[1]

CHAPTER-1

DEMO INTRODUCTION In this position dipole is in stable equilibrium position.
MScah[r1ke]imngeWheTTnIiPpθSs:=&0EºXPEθLilAseacNtnArigTclIefOiebNledtawnedednipole

Since two equal and opposite force are acting The word 'micro' means small.

QUESTION oSnOdLipUoTlIeOhNence it experience a torque. τ = Explanation:

Define microeconomics. foMrcicero×epceornpoemnidciscuislasrtduidsytaonfciendbievtiwdueaelnecchoanrogmesic Microeconomics is the study of individuals, households
Or [1] Outside Delhi Set-1 2012 τu=nFit s×udch as househo{lds=,2indsuinsθtr}ies. etc. [½] and firms' behavior in decision making and allocation of
τ = F × 2 sinθ
Give the meaning of micro-economics. In threisspoousrciteiosn. Idtigpeonleeirsalilny uanpsptlaiebsletoeqmuailribkreiutsmof goods and
[5] Herseervθic=e1s80aond deals with individual and economic issues
[1] Delhi set 3 2009 This torque becomes zero when θ = 0º (per-

manent equilibrium) when θ = 180º, (unstable

Tick: How do you find this question? equilibrium)

Easy V. Difficult Hence f = 0

4

1. A uniform half metre rule balances horizontally on a knife edge at 29 cm mark 1. A uniform half metre rule balances horizontally on a knife edge at 29 cm mark
whenPhysics Booklet_Unit 1_.indd 4 a weight of 20 gf is suspended from one end.
when a weight of 20 gf is suspended from one end. 8/17/2018 8:35:18 AM