A coil consisting of 200 turns of wire has its ends
connected to a circuit such that the total resistance of
the coil and the circuit is 2.0 ohm. There is no source of
e.m.f. in the circuit. Each turn of the coil is a square of
side 18 cm, and a uniform magnetic field directed
perpendicular to the plane of the coil is turned on. If the
field changes linearly from 0 to 0.5 T in 0.8 s, what is
the magnitude of the current in the coil while the field is
changing?
The magnitude of electrostatic force between two identical
positive ions that are separated by a distance of 5.0 x 10–
10 m is 3.7 x 10–9 N. (a) What is the charge of each
ion? (b) How many electrons are “missing” from each ion?
An ice-box is built of wood 1.75 cm thick, lined with cork
3 cm thick. If in the steady state the temperature of the
inner surface of the cork is 0 ºC and that of the outer
surface of wood is 12 ºC, what is the temperature of the
wood-cork interface? The thermal conductivities of wood and
cork are 0.2 W/m-K and 0.04 W/m-K respectively
a car is travelling at 72kmph, and if that car slows down
to 60kmph it takes an extra 1 hour to cover that same
distance. at 72kmph, how long did it take for the car to
cover that distance?
Mercury thermometer is constructed as shown in Figure
The capillary tube has a diameter of 0.004 cm, and the bulb
has a diameter of 0.250 cm.
neglecting the expansion of the glass, find the change in
height of the mercury column
that occurs with a temperature change of 30.0 °C.
73
why does a drop of water thrown into a hot frying pan jump
around?
the question from which area of physics in ONGC Written
examination in physics can we expect more?
73
I just want to convert the voltage into current i.e.
suppose I have 750V & 1A AC power then I want to convert it
into 12V & 62A DC power only difficulty is that I don't
want to use the tranceformer. Simply to say, I want to make
the step-down without using tranceformer. Please, give me
some ideas.
And also I want the relation between Magnetic Induction &
Weight of the body can be levitated. Or I can say, how much
of magnetic induction requires to lift 500gms weight?
I am heartily thankful to you.
71
WHY IS MAGNETIC NEEDLE POINTD?
47
how much mercury overflows when a glass vessel filled to
the brim with 50 cubic centimeter of mercury 15°C is heated
to 75°C of glass?
70
what is mariners compass
56
What is the meaning of ‘steady state’ in the context of
transmission of heat?
56
while climbing a hill or mountain we bend forward.
give a scientific expalantion in a simple way
64
How to prepare for the post State bank of india clerk
personal interview ?
what is the difference between opticalzoom,dizitalzoom and
smartzoom
60
when does one exert greater pressure on ground during
walking or standing? why ?
what happends to the period of a simple pendulum taken into
a deep mine
65
the force of attraction of earth on a man, who is inside
the artificial satellite, is Zero
state whether the above statement is correct, if not
correct please give the correct answer
What is the avarege speed of people fencing like at the
olympic games. (sorry for the misspelled words)
65
I want to prepare a frequency generator. the specifications
i.e. output requirements are 12V, 1-10A & frequency upto 1K
to 5K. Please, inform me with proper circuit dig. & the
component values.
61
An ice-box is built of wood 1.75 cm thick, lined with cork
3 cm thick. If in the steady state the temperature of the
inner surface of the cork is 0 ºC and that of the outer
surface of wood is 12 ºC, what is the temperature of the
wood-cork interface? The thermal conductivities of wood and
cork are 0.2 W/m-K and 0.04 W/m-K respectively
48
i need the working and properties of the sextent and all
the objects and much more about sextent..
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