Question
What are circular and elliptically polarized light?
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The blocks shown in figure have equal masses. blocks in the process. The surface of A is smooth but that of B has a friction coefficient of 0.10 with the floor. Block A is moving at a speed of 10m/s towards B which is kept at rest. Find the distance travelled by B if
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Two charges $\pm 10 \mu C$ are placed $5.0 mm$ apart. Determine the electric field at $(a)$ a point $P$ on the axis of the dipole $15 \ cm$ away from its centre $O$ on the side of the positive charge, as shown in Fig. $1.18( a ),$ and $(b)$ a point $Q , 15 \ cm$ away from $O$ on a line passing through $O$ and normal to the axis of the dipole, as shown in Fig. $1.18(b)$.
→A person stands on a spring balance at the equator.
- By what fraction is the balance reading less than his true weight?
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A myopic adult has a far point at 0.1m. His power of accomodation is 4 diopters.
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A pin of length 2.0cm lies along the principal axis of a converging lens, the centre being at a distance of 11cm from the lens. The focal length of the lens is 6cm. Find the size of the image.
The position, velocity and acceleration of a particle executing simple harmonic motion are found to have magnitudes 2cm, 1m/s and $10m/s^2$ at a certain instant. Find the amplitude and the time period of the motion.
→A person standing on the floor of an elevator drops a coin. The coin reaches the floor of the elevator in a time $t_1$ if the elevator is stationary and in time $t_2$ if it is moving uniformly. Then :
→Suppose we want to verify the analogy between electrostatic and magnetostatic by an explicit experiment. Consider the motion of (i) electric dipole p in an electrostatic field E and (ii) magnetic dipole m in a magnetic field B. Write down a set of conditions on E, B, p, m so that the two motions are verified to be identical. (Assume identical initial conditions.)
Two steel rods and an aluminium rod of equal length $l_0$ and equal cross section are joined rigidly at their ends as shown in the figure below. All the rods are in a state of zero tension at $0^\circ C$. Find the length of the system when the temperature is raised to $\theta$. Coefficient of linear expanaion of aluminium and steel are $\alpha_\text{a}$ and $\alpha_\text{s}$respectively. Young's modulus of aluminium is $Y_a$ and of steel is $Y_s.$
→Consider a metal ring kept on top of a fixed solenoid (say on a carboard) (Fig). The centre of the ring coincides with the axis of the solenoid. If the current is suddenly switched on, the metal ring jumps up. Explain.
