- ADiamagnetism.
- BParamagnetism.
- CFerromagnetism.
- DBoth a and b.
Explanation:
Diamagnetism (where orbital motion of electrons creates tiny atomic current loops, which produce magnetic fields) is a property of all materials and opposes applied magnetic fields, but is very weak.
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In the given figure, battery E is balanced on 55 cm length of potentiometer wire but when a resistance of 10 W is connected in parallel with the battery then it balances on 50 cm length of the potentiometer wire then internal resistance r of the battery is

|
(a) 1 W |
(b) 3 W |
(c) 10 W |
(d) 5 W |

The radius of circular path of an electron when subjected to a perpendicular magnetic field is
|
(a) |
(b) |
(c) |
(d) |
$\text{P}_0$
$\text{P}_0+ \frac{2\text{S}}{\text{r}}$
$\text{P}_0- \frac{2\text{S}}{\text{r}}$
$\text{P}_0- \frac{4\text{S}}{\text{r}}$