Question

7. Resistances R, R., R, and R. are
connected as shown in the figure. Si
and S2 are two keys. Discuss the
current flowing in the circuit in the
following cases.
R
С
D
F
H
A
S
1
B
E
S.
R.
ad
w
we
+
G
I
А
R
3
a. Both S, and S, are closed.
b. Both S and S, are open.
c. S. is closed but S is open.
1
2
2.​

Answer 1

Answer:

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12th

Physics

Current Electricity

Problems on Combination of Resistors

Two resistance are connecte...

PHYSICS

Two resistance are connected in series as shown in diagram. What is the value of R?



A

4Ω

B

6Ω

C

5Ω

D

3Ω

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ANSWER

 Voltage across 5Ω resistor is V=10V

Current, I=RV=510

⟹I=2A

Since resistance 5Ω and R are in series and hence current through both resistance is same.

Hence current through R is also 2A.

Now for R, potential difference is V=6V and I=2A.

Hence , R=IV=26

⟹R=3Ω

Answer-(D)

Explanation:

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