Two candles of equal height h are placed in between vertical walls on a line perpendicular to the walls at a distance a from each other and also from the nearer wall. With what speed will the shadows of the candles move along the walls if one burns out completely in time `t_(1)` and the other in time `t_(2)`.
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Four points are such that the line joining any two points is perpendicular to the line joining other two points. If three point out of these lie on a
Correct Answer - A The point are such that one of the points is the orthocenter of the triangle formed by other three points. When the vertices of a triangle lie...
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A particle of mass m is trapped between two perfectly rigid parallel walls. The particle bounces back and forth between the walls without losing any e
Correct Answer - (a) `(h^(2))/(mL^(2))` , (b) `5 xx 10^(-54) J`
2 Answers 2 views
Two identical dipoles have their axes at right angles to each other and also bisecting each other . Calculate the field at a distance r from the point
Correct Answer - `E = (1)/(4 pi epsi_(0)) (p)/(r^(3)) sqrt( 5 + 3 "sin" 2 theta)`
2 Answers 1 views
Two bar magnets of length 0.1m and poles strength 75m each, are placed on the same line. The distance between their centres is 0.2 m. what is the reul
Correct Answer - (i) `3.4 xx 10^(-2)N` (attraction) (ii) `3.4 xx 10^(-2)N` (repulsion)
2 Answers 2 views
A long, vertical magnet is placed at a perpendicular distance of 0.8m from the centre of a horizontal magnetic needle of length 0.12 m ad pole strengt
Correct Answer - 645 Am
2 Answers 1 views
Two equal charges, +Q each, are at a distance r from each other. A third charge is placed on the line joining the above two charges such that all thes
Correct Answer - `q=Q//4`
2 Answers 2 views
A charge Q is placed at each of the two opposite corners of a square of side a.A charge is placed at each of the other two corners. (a) if the reultan
Correct Answer - `Q=-2sqrt2q,1/(4piepsi_0)*(-7q^2)/(sqrt2Q)` they form a stable system
2 Answers 3 views
Two long straight wires with equal cross-sectional radii a area located parallel to each other in air at large distance b from each other. Find the ca
Correct Answer - `(piepsilon_(0))/(In b//d)`
2 Answers 1 views
Two bar magnets of length `0.1` m and pole strength `75 Am` each , are placed on the same line . The distance between their centres is `0.2` m . What
Correct Answer - `(i) 3.4 xx 10^(-2) N` (attraction ) , (ii) ` 3.4 xx 10^(-2)` N (repulsion)
2 Answers 8 views
Two equal charges, `2.0xx10^(-7) C` each, are held fixed at a separation of 20cm. A third charge of equal magnitude is placed midway between the two b
Correct Answer - `-3.6xx10^(-3)J`
2 Answers 1 views