MCQ
The EMF of a cell can be defined as:
- AWork done in taking a unit positive charge once round the circuit.
- BThe open circuit voltage of the cell.
- CThe terminal voltage when the current is zero.
- DAll the above.
Explanation:
EMF of cell can be defined as:
→ Workdone in taking unit positive charge once round the circuit.
→ The open circuit voltage of cell.
→ The terminal voltage when current is zero.
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Two identical cells send the same current in 2Ω resistance, whether connected in series or in parallel. The internal resistance of the cell should be
|
(a) 1 Ω |
(b) 2 Ω |
(c) |
(d) 2.5 Ω |
In hydrogen atom, the electron makes 6.6 revolutions per second around the nucleus in an orbit of radius 0.5
. It is equivalent to a current nearly
|
(a) 1 A |
(b) 1 mA |
(c) 1 μA |
(d) 1.6 |