Explanation:
Static electricity is produced when a suitable combination of substances (e.g., glass rod and silk, ebonite rod and cat's skin, sealing wax and wool) are rubbed together and get electrified due to friction.
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64 drops of mercury each charged to a potential of 10V. They are combined to form one bigger drop. The potential of this drop will be (Assume all the drops to be spherical)
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(a) 160 V |
(b) 80 V |
(c) 10 V |
(d) 640 V |
$\text{E}_0\text{k}=\text{B}_0\omega$
$\text{E}_0\text{B}_0=\omega\text{k}$
$\text{E}_0\omega=\text{B}_0\text{k}$
A flat circular disc has a charge +Q uniformly distributed on the disc. A charge +q is thrown with kinetic energy E towards the disc along its normal axis. The charge q will
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(a) Hit the disc at the centre |
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(b) Return back along its path after touching the disc |
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(c) Return back along its path without touching the disc |
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(d) Any of the above three situations is possible depending on the magnitude of E |
A convex lens is used to form real image of an object on a screen. It is observed that even when the positions of the object and that screen are fixed there are two positions of the lens to form real images. If the heights of the images are 4 cm and 9 cm respectively, the height of the object is
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(a) 2.25 cm |
(b) 6.00 cm |
(c) 6.50 cm |
(d) 36.00 cm |
The curves (a), (b) (c) and (d) show the variation between the applied potential difference (V) and the photoelectric current (i), at two different intensities of light (I1 > I2). In which figure is the correct variation shown
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(a)
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(b)
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(c)
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(d)
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