Question

current in the ammeter shown is zero in the given circuit. What is the value of E ?

Answer 1

if the current is 0 then energy will be also 0

Answer 2

Answer:

Let, i is the current flowing through the circuit. In the given circuit the ammeter reading is zero.

Hence, the voltage drop across 500Ω resistance is 10V (as the batteries are oppositely connected).

The current through 500Ω resistance is,

i=10/500

i=1/50A

Hence by Ohm's law for resistance R, we can write

R×1/50=2

. ; R=100ohm