By a cell a current of 0.9 A flows through 2 ohm resistor and `0.3 A` through 7 ohm resistor. The internal resistance of the cell is

Options

A. 0.5 ohm
B. 0.4 ohm
C. 0.3 ohm
D. 0 ohm

Answer

(i) at O, (ii) diagonally from O to 3 (iii) along OY', (iv) at O (v) diagonally from O to 4 (vi) at O

Explanation

(i) The centre of mass remains at O as the excluded masses are symmetrically placed. (ii) CM shifts from 0 to 3 diagonally (iii) CM shifts along OY (iv) CM does not shift. (v) CM shifts diagonally from 0 to 4 (vi) CM doesnot shift