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Simple 'spring' balance Punch four holes in an old tin lid with a nail, spacing them partially round the circumference. Pass pieces of string by these holes and tie them togeth
RESISTANCE: An electric current is a flow of free electrons through a conductor. The size of current flowing through a conductor for a given applied voltage depends on: • T
Reducing friction by an air stream Cut out a disc of cardboard about 10 cm in diameter. With a red-hot pin, burn a hole by the centre. Saw a small cotton reel in half and glue
Q. An aircraft having awing span of 20.48 m flies at a speed of 40 ms -1 . If the vertical component of the earth's magnetic field is 2 X 10 -5 T, compute the emf induced between
Inertia in a pile of books Stack up a pile of books. Grasp hold of the single at the bottom of the pile and give it a quick jerk. Can you delete it without upsetting the whole
(i) X-rays are electromagnetic waves with wavelength lie among 0.1Å - 100Å. (ii) X-rays is invisible. (iii) They always go in a straight line with speed of light. (iv) X
A passenger sitting in the rear of a bus claims that she was injured as the driver slammed on the breaks, causing a suitcase to come flying towards he from the front of the bus. If
INSTANTANEOUS ACCELERATION: The acceleration of the body at any certain instant during its motion is called to be an instantaneous acceleration.
Three similar coils, each having a resistance of 8 and an inductive reactance of 8 are connected (a) in star and (b) in delta, across a 415V, 3-phase supply. Measure for
A battery and the plug points in the switch boards home give potential difference. What is the disimilar in the nature of the current given by the two? Compare and contrast the tw
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