-l Series : SMA/tl m-w:r. Code No. 55/1/2

Candidates must write the Code on the title page of the answer-book.

~ \1JTq CoR~ fcf;-~ >w-1-lT;f ll ~ ~ 11 t I >w-1-lT;f ll ~ ~ Cf>l3ffi" ~ ~ cnTs ~ cnT ~ "3W-~ ell~-~ 1R fu"cl I ~ \1JTq CoR~ fcf;-~ >w-1-lT;f ll 30 >w-1 t I ~~q;r~~w~~~,~q;r~~~ 1 ~ >w-=r-lT;f cnr 1liR ell ~ 15 fl:RG Cl)f ~ m TfCIT t 1 >w-=f-1T;I" Cl)f fc:Rur-~ 1l 1 o.15 ~

~ ~ I 10.15 ~ ~ 10.30 ~ (TCfi~ ~ >w-=f-lT;f ~~~~ell~ "

--- ----------~-----------------------

(iv) JIH-TT:f if WHr W cnJt fcrcm;rr -#f t I ~ ~ 3{qff CfTff f!Cfi"JIH if, rfFr 3{qff CfTff f!Cfi" JIH if ahr riff~ 3fqif CfTf'f rft;:rf mf if 31/PftRCh 'qGFf ~ fcn

3. it-W"ffi cit 4RCfl

10. ~ 4R'1tf

15. ~~ CfiT ~ ~~ (t.~.~.) E 3l1r diH'IRCfl ~ 'r' ~ I~~ -CflT -eJ ~ ~ R1 3l1r R2 (MT ~ ~ ~ ~ ~ l"](:IT ~ I ~ ll ~ CfiT llR f.:ll=iifCbo 'qT{ fciN;:;:r ~ lll1f1TI l"](:IT ~ : 2 (i) ~~"Jl-CflTt~~~~ I (ii) ~~ll~R1 ~~I (iii) ~ ~ ll R1 (MT R2 ~ ~ ll ;8;q)f~ct t I (iv) ~ ~ ll R1 (MT R2 m ~ ~ ll :8'41f~o t I ~ 'qT{ 4Rf-Mfr1'4'i ll ~ 't-ffilaTI ~ llR, 0.42 A, 1.05 A, 1.4 A (MT 4.2 A t I ~' ~ dilcF(liCfl ~ ~ fcf;-~ 't-ffilaTI ~ ~ llR ~ ~ ~ ~ ll it if I ol, ~ ~~~m~"ll~'t-ffil~llRcril~~ 1 A cell of emf E and internal resistance r is connected to two external resistances R1 and R2 and a perfect ammeter. The current in the circuit is measured in four different situations : (i) without any external resistance in the circuit (ii) with resistance R1 only (iii) with R1 and R2 in series combination (iv) with R1 and R2 in parallel combination The currents measured in the four cases are 0.42 A, 1.05 A, 1.4 A and 4.2 A, but not necessarily in that order. Identify the currents corresponding to the four cases mentioned above.

16. -eJ~ ~i'IICfll{ ~ ~ P(M"[Qll~ctft~r~ I~~~: I (MT 21 ~ ~ m- -dT ~ 1

17. 'L' ~cit~~cit~~' 'ro' ~~~W~croR~~fq;; ~~ fuu 'L' ~ ~ ~ ~ ~ crw:r (RlT) ~ ~ 1K \iW ~ ~ 3fu" ~ fuu crw:r cit~ W ~ ~ I ~cit croR ~' crffi cWD ~ ~ ~ ~ ~ ~ 3fu" qw:r ~w:mR ~ ~

~ I ~ ~ (fliT ~ W1R 'qklc:6\4 ~ B, 00 fqJqH ~ I crffi (RlT) ~ ~ (fliT crffi ~ q'T:qt_~.~- ~~tWI)~fu-4~~~~ I 2 A metallic rod of 'L' length is rotated with angular frequency of 'ro' with one end hinged at the centre and the other end at the circumference of a circular metallic ring of radius L, about an axis passing through the centre and perpendicular to the plane of the ring. A constant and uniform magnetic field B parallel to the axis is present everywhere. Deduce the expression for the emf between the centre and the metallic ring.

1s. ~ oo ~ ~ em oo m.m. ~ 'lWT tR:U ~ ~ ~ \Jffi'IT ~ m- q# ~ ~ ~ mm-, ~, ~.m.

In the figure a long uniform potentiometer wire AB is having a constant potential gradient along its length. The null points for the two primary cells of emfs E1 and E2 connected in the manner shown are obtained at a distance of 120 em and 300 em from the end A. Find (i) E1/E2 and (ii) position of null point for the cell E 1. How is the sensitivity of a potentiometer increased?

.....-----1 111----'VV'VV\r---.,

IE---- 300 em ---+ 120 em---+

A \----------:r--:~---'B ...,

OR Using Kirchoffs rules determine the value of unknown resistance R in the circuit so that no current flows through 4 n resistance. Also find the potential difference between A and D.

l.Q 4Q R

I I 6V A I B C

9V 3V 20. anW cfq;r) .q ~ TT

21. (31) -mm C4focn

24. (31) ~ ~ ~ CfiTufr

r

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'i{~:?ICfl ~ 3 km ~ Wl, 1 oo m ~ CJCR Cfil ~ ~ m 31Rm !:lfuf

(a) Draw the circuit diagram of a full wave rectifier using p-n junction diode. Explain its working and show the output, input waveforms.

(b) Show the output waveforms (Y) for the following inputs A and B of (i) OR gate (ii) NAND gate

t2 t3 t4 ts t6 t1 I I I

.....

ts I I I I I I

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~ ~ CfiT ~ 4l'i1'11Cio ~ ~ 3fu" ~ ~ CfiT ~ ~ I cp:rr ~ ~ ~ ~~~Cfft~mlRcnTt~mort?~~ 1

~

(at) ~ ~ Cfft ~ fufuJct I ~ ~.~. (S.I.) liDrcP cp:rr t?

55/1/2

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r=r> ~ ~ cn1 mrr cp:rr wrr, ~ m ~ (i) ~HI~fl('lo m (ii) 5fi011~fl('lo m ? Explain the principle of a device that can build up high voltages of the order of a few million volts. Draw a schematic diagram and explain the working of this device. Is there any restriction on the upper limit of the high voltages set up in this machine? Explain.

OR (a) Define electric flux. Write its S.l. units. (b) Using Gauss's law, prove that the electric field at a point due to a uniformly

charged infinite plane sheet is independent of the distance from it. (c) How is the field directed if (i) the sheet is positively charged, (ii) negatively

charged?

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