In this simple circuit, if R is changed to 2R, the ammeter reading A will (a) Go

Question

In this simple circuit, if R is changed to 2R, the ammeter reading A will (a) Go down (b) Go up (c) Remain same (d) Hard to tell In this simple circuit, if V is changed to 2V, the ammeter reading A will (a) Go down (b) Go up (c) Remain same (d) Hard to tell In this simple circuit, if V is changed to 2V, R is changed to 4R, the ammeter reading A (a) Go down (b) Go up (c) Remain same (d) Hard to tell In "Wheatstone Bridge Circuit" experiment, for a given R_k and R_x, you find your galvanometer (G) in NULL condition as shown in Figure. What you can say: (a) Rx > Rk (b) Rx

Explanation / Answer

here,

6)

if R is changed to 2R

the resistance is doubled

and the voltage remains constant

and I = V/R

so the current decreases

and the reading a) goes down

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