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How will the rending of the ammeter chan...

How will the rending of the ammeter change if the key K is closed?

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A coil A is connected to an A.C. ammeter and another coil B to A source of alternaing e.m.f. How will the reading of ammeter change if a copper plate is introduced between the coils as shown.

For the given circuit. Calculate reading of ammeter when key K is closed.

Knowledge Check

  • In the given circuit , when key K is open, reading of ammeter is I. Now key K is closed, then the correct statement is

    A
    If `epsilon_1 lt IR`, reading og the ammeter is less than I.
    B
    If `IR gt epsilon_1`, reading of the ammeter is greater than I.
    C
    If `epsilon_1 gt 2IR`, reading og the ammeter will be zero.
    D
    Reading of ammeter will not change.

  • In the circuit in fig. If no current flows through the galvanometer when the key k is closed, the bridge is balanced. The balancing condition for bridge is

    A
    `(C_1)/(C_2) = (R_1)/(R_2)`
    B
    `(C_1)/(C_2) = (R_2)/(R_1)`
    C
    `(C_1^(2))/(C_(2)^(2)) = (R_(1)^(2))/(R_(2)^(2))`
    D
    `(C_(2)^(1))/(C_(2)^(2))= (R_(2))/(R_(1))`

  • A charged capacitor is allowed to dischare through a resistor by closing the key at the instant t=0 . At the instant t=(ln 4)mus , the reading of the ammeter falls half the initial vaslue. The resistance of the ammeter is equal to

    A
    `0.5Omega`
    B
    `1Omega`
    C
    `2Omega`
    D
    `4Omega`

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    If the resistance R_(1) is increased (see figure), how will the reading of the ammeter and voltmeter change ?

    If the resistance R_(1) is increased how will the reading of the ammeter and voltmeter change

    The battery is charged from full wave rectifier fed by a sinuoidal voltage (see figure). Idea diodes, ammeter and voltmeter show the time average value. At idle with only key K_(1) closed, coltmeter shows 12 V, and current is then absent, ie, reading of ameter is 0. if only the key K_(2) is closed, the voltmeter shows battery voltage at 12.3 V. during charging when the K_(1) and K_(2) are closed, the voltmeter shows 12.8 V and ammeter shows 5 A. Find the internal resistance of battery.

    In the given figure when the key is open the ammeter reading is 5 amp. What will be the ammeter reading when the key is closed

    In the figure shown is a R-L circuit connected with a cell of emf epsilon through a key k. If key k is closed find the current drawn by the battery (a) just after the key k is closed (b) long after the key k is closed

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