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441.
Assume that each diode as shown in the figure has a forward bias resistance of 50 Ω and an infinite reverse bias resistance. The current through the resistance 150 Ω is

0.66 A

0.05 A

Zero

0.04 A

0.04 A

The circuit is

As the lower diode attached to 100 Ω resistance is in reversed biased so, it is non- conducting.

Now, the circuit can be redrawn as,

∴ Current through the circuit, $I = \frac{V}{R}$

$= \frac{10}{250} = 0.04 A$

442.

Two cells A and B of emf 2V and 1.5 V respectively, are connected as shown in figure through an external resistance 10 Ω. The internal resistance of each cell is 5 Ω. The potential difference E_A and E_B across the terminals of the cells A and B respectively are