A electrical circuit is said to be closed when current is started to flow after switch on.

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Q1

When should we say that the circuit is closed?

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Q2

When should we say the circuit is open?

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Q3

When would you say an electric circuit is closed?

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Q4

When we kept the potential of source constant ; can we say that current is equally distributed over the circuit

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Q5

In limts, we speak of the value of a function when it tends to a given number. As we say:

lim_{x-->a} f(x), we mean to say we are trying to find the value of f(x) as x tends to a number a.

But how close exactly is this? I mean how close to a should x be when we say x-->a. The value of x can be a + 0.0001 or it can be a + 0.000000001. So what should the value of x be as we say x tends to a?