Question:-
A rigid beam of negligible weight is supported in a horizontal position by two rods of steel and aluminium, 2m and 1m long having values of cross – sectional areas 1cm2 and 2cm2 and E of 200GPa and 100GPa respectively. A load P is applied as shown in the figure

If the rigid beam is to remain horizontal then
Option (A)
The forces on both sides should be equal
Option (B)
The force on aluminium rod should be twice the force on steel
Option(C)
The force on the steel rod should be twice the force on aluminium
Option(D)
The force P must be applied at the centre of the beam
Correct Option:
(B)
Question Solution:
For rigid beam is to remain horizontal (dl)Al. = (dl)st.
{(FAl. x 1) / (2 x 100)} = {(Fst. x 2) / (1 x 200)}
FAl. = 2Fst.
question-answer-faq-9361