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First a set of n equal resistors of R ea...

First a set of n equal resistors of R each are connected in series to a battery of emf E and internal resistance R. A current I is observed to flow. Then, the n resistors are connected in parallel to the same battery. It is observed that the current is increased 10 times. What is 'n'?

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Knowledge Check

  • A set of 'n' equal resistor, of value of 'R' each are connected in series to a battery of emf 'E' and internal resistance 'R' . The current drawn is I . Now, the 'n' resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 10.1. The value of 'n' is

    A
    9
    B
    10
    C
    20
    D
    11

  • A set of 'n' equal resistors, of value 'R' each are connected in series to a battery of emf 'E' and internal resistance 'R' in parallel to be same battery. Then the current drawn from battery becomes 101. The value of 'n' is

    A
    20
    B
    11
    C
    10
    D
    9

  • A battery of emf E and internal resistance r is connected to a variable resistor R as shown in figure. Which one of the following is true ?

    A
    Potenital difference across the terminals of the battery is maximum, when R=r
    B
    Power delivered to the resistor is maximum when R=r
    C
    Current in the circuit is maximum when R=r
    D
    Current in the circuit is maximum when `R gt gt r`