MEDIUM
11th West Bengal Board
IMPORTANT
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The load versus elongation graph for four wires of the same material is shown in Fig. The thinnest wire is represented by the line.

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Important Questions on Elasticity

MEDIUM
11th West Bengal Board
IMPORTANT

Assertion (A): Ductile metals are used to prepare thin wires.

Reason (R) : Jn the stress-strain curve of ductile metals, the length between the points representing elastic limit and breaking point is very small.

HARD
11th West Bengal Board
IMPORTANT
A wire of initial length L and radius r is stretched by a length l. Another wire of the same material but with initial length 2L and radius 2r is stretched by a length 2l. The ratio of the stored energy per unit volume in the first and second wire is
MEDIUM
11th West Bengal Board
IMPORTANT
One end of a horizontal thick copper wire of length 2L and radius 2R is welded to an end of another horizontal thin copper wire of length L and radius R. When the arrangement is stretched by applying forces at two ends, the ratio of the elongation in the thin wire to that in the thick wire is
HARD
11th West Bengal Board
IMPORTANT
A solid sphere of radius R And density ρ Is attached to one end of a massless spring of force constant k. The other end of the spring is connected to another solid sphere of radius R And density 3ρ. The complete arrangement is placed in a liquid of density 2p And is allowed to reach equilibrium. The correct statement is (are).
HARD
11th West Bengal Board
IMPORTANT
The length of a metal wire is L1 when the tension is T1 and L2 when the tension is T2. The unstretched length of the wire is