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By a cell a current of 0.9 A flows throu...

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

A

0.5 ohm

B

0.4 ohm

C

0.3 ohm

D

0 ohm

Text Solution

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The correct Answer is:
(i) at O, (ii) diagonally from O to 3 (iii) along OY', (iv) at O (v) diagonally from O to 4 (vi) at O
(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
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