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Q.

In the give circuit ammeter and voltmeter are ideal. When the switch K is on, the ammeter reading is 1mA and voltmeter reading is 3V. Neglecting the internal resistance of the battery, the values of R and emf E of cell are
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a

R=500 Ω;E=3  V

b

R=1.5  Ω;E=5  V

c

R=1500  Ω;E=7.5  V

d

R=3000 Ω;E=15  V

answer is A.

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Detailed Solution

itotal=2mA=2×10−3A
V=R.itotal ⇒3=R.2×10−3⇒R=1500Ω Req=R+R2+R=2.5R
E=Req.itotal ⇒E=(2.5)×(1500)×2×10−3=7.5V

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