MCQ
Electromotive Force (EMF) may be defined as:
- AWork done per coulomb on the charge.
- BDrift velocity of electrons.
- CFlow of electron.
- DThe number of coulombs of charge per second.
Explanation:
Electromotive Force (EMF) may be defined as work done per coulomb on the charge.
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Voltmeters V1 and V2 are connected in series across a D.C. line. V1 reads 80 volts and has a per volt resistance of 200 ohms. V2 has a total resistance of 32 kilo ohms. The line voltage is
|
(a) 120 volts |
(b) 160 volts |
(c) 220 volts |
(d) 240 volts |
$\text{Mr}^2$
$\frac{1}{2}\text{Mr}^2$
$\frac{1}4{}\text{Mr}^2$
$\frac{2}{5}\text{Mr}^2$
By properly combining two prisms made of different materials, it is possible to:
Twists of suspension fibre should be removed in vibration magnetometer so that
| (a) Time period be less | (b) Time period be more |
| (c) Magnet may vibrate freely | (d) Cannot be said with certainty |