A battery of emf 100 V and a resistor of resistance 10 kΩ are joined in series. This system is used

A battery of emf 100 V and a resistor of resistance 10 kΩ
are joined in series. This system is used as a source to
supply current to an external resistance R. If R is not
greater than 100 Ω, the current through it is constant
up to two significant digits. Find its value. This is the
basic principle of constant-current source.
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