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Frequently Asked IIT-JEE Latest Exam Pattern - IIT-JEE Sample Question with Solutions Page 39

(#M40027814) IIT-JEE QUESTION 2011 question Keep an EYE

The magnetic field in a traveling electromagnetic
wave has a peak value of 20 nT. The peak value of
electric field strength is -
(1) 9 V/m (2) 12 V/m
(3) 3 V/m (4) 6 V/m

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(#M40027813) IIT-JEE QUESTION 2011 question Keep an EYE

In an LCR circuit both switches
are open initially. Now switch S1 is closed S2 kept
open. (q is charge on the capacitor and τ = RC is
Capacitive time constant). Which of the following
statement is correct ?
(1) At t = 2τ, q = CV (1 – e–2)
(2) At t =
2
τ , q = CV (1 – e–1)
(3) Work done by the battery is half of the energy
dissipated in the resistor
(4) At t = τ, q = CV/2

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(#M40027811) IIT-JEE QUESTION 2011 question Keep an EYE

Two short bar magnets of length 1 cm each have
magnetic moments 1.20 Am2 and 1.00 Am2
respectively. They are placed on a horizontal table
parallel to each other with their N poles pointing
towards the South. They have a common magnetic
equator and are separated by a distance of 20.0
cm. The value of the resultant horizontal magnetic
induction at the mid-point O of the line joining
their centres is close to

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(#M40027808) IIT-JEE QUESTION 2011 question Keep an EYE

A diode detector is used to detect an amplitude
modulated wave of 60% modulation by using a
condenser of capacity 250 pico farad in parallel
with a load resistance 100 kilo ohm. Find the
maximum modulated frequency which could be
detected by it -
(1) 5.31 MHz (2) 5.31 kHz
(3) 10.62 MHz (4) 10.62 kHz

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(#M40027807) IIT-JEE QUESTION 2011 question Keep an EYE

circular loop of radius 0.3 cm lies parallel to a
much bigger circular loop of radius 20 cm. The
centre of the small loop is on the axis of the bigger
loop. The distance between their centres is 15 cm.
If a current of 2.0 A flow through the smaller loop,
then the flux linked with bigger loop is

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(#M40027805) IIT-JEE QUESTION 2011 question Keep an EYE

Two capacitors C1 and C2 are charged to 120 V
and 200 V respectively. It is found that by
connecting them together the potential on each one
can be made zero -
(1) 3C1 + 5C2 = 0 (2) 9C1 = 4C2
(3) 5C1 = 3C2 (4) 3C1 = 5C2

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(#M40027804) IIT-JEE QUESTION 2011 question Keep an EYE

Assume that a drop of liquid evaporates by
decrease in its surface energy, so that its
temperature remains unchanged. What should be
the minimum radius of the drop for this to be
possible ? he surface tension is T, density of liquid
is ρ and L is its latent heat of vaporization -

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(#M40027801) IIT-JEE QUESTION 2011 question Keep an EYE

A metallic rod of length 'l ' is tied to a string of
length 2l and made to rotate with angular speed ω
on a horizontal table with one end of the string
fixed. If there is a vertical magnetic field 'B' in the
region, the e.m.f. induced across the ends of the
rod is -

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(#M40027798) IIT-JEE QUESTION 2011 question Keep an EYE

A beam of unpolarised light of intensity I0 is
passed through a polaroid A and then through
another polariod B which is oriented so that its
principal plane makes an angle of 45º relative to
that of A. The intensity of the emergent light is -

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(#M40027796) IIT-JEE QUESTION 2011 question Keep an EYE

Diameter of a plano-convex lens is 6 cm and
thickness at the centre is 3 mm. If speed of light in
material of lens is 2 × 10^8 m/s, the focal length of
the lens is -
(1) 30 cm (2) 10 cm
(3) 15 cm (4) 20 cm

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