Test Index

ICSE Class 10 Physics 2019 Solved Paper

Show Para  Hide Para 

The diagram above shows a circuit with the key k open. Calculate :
© examsnet.com
Question : 61
Total: 74
the resistance of the circuit when the key k is closed.
Solution:  
When key K is closed, External Resistance is
‌
1
Rp
‌=‌
1
(2+3)
+‌
1
5

‌=‌
1
5
+‌
1
5
=‌
2
5
∴‌‌RP=‌
5
2
=2.5Ω
∴ Total resistance
‌=RP+r
‌=2.5+0.5
‌=3Ω
© examsnet.com
Go to Question:
Prev Question
Next Question