Physics
A 9 V battery has an internal resistance of 12 Ω. The potential difference across its terminals when it is supplying a current of 50 mA is
- 8.94 V
- 8.4 V
- 9.06 V
- 9.6 V
Current Electricity
12 Likes
Answer
8.4 V
Reason — Given,
Emf of battery (V) = 9 V
Internal resistance = 12 Ω
Current (I) = 50 mA = 50 x 10-3 A
From formula
V = E - Ir
V = 9 - (50 x 10-3 x 12) = 9 - 0.6 = 8.4 V
Answered By
7 Likes
Related Questions
On reversing the direction of current in a wire, the magnetic field produced by it
- get reversed
- increases in strength
- decreases in strength
- remains unchanged in strength and direction
At which temperature, molecular motion ceases?
- 273 K
- -273 K
- 0 K
- 0°C
Assertion: The current is the rate of flow of charges.
Reason: Electric current will not flow between two charged bodies having same potential when connected.
- Both Assertion and Reason are true.
- Both Assertion and Reason are false.
- Assertion is false but Reason is true.
- Assertion is true but Reason is false
The sensation of sound persists in our brain for about
- 0.001 s
- 0.2 s
- 0.1 s
- 10 s