I | 0.2 | 0.4 | 0.6 | 0.8 | 1.0 | 1.2 | 1.4 |
V | 0.8 | 1.6 | 2.4 | 3.2 | 4.0 | 4.8 | 5.6 |
Answer:
The
relation between resistance potential difference and current is V= IR (1)
SI
unit of resistance (1)
Copper
and silver obey Ohm's law. (1)
The
I-V graph is shown below
On
putting the graph between V and I from the given data, a straight line is
obtained, thus the given data verifies Ohm's law. (2)
Or
An
electromagnet is a coil of insulated conducting wire wound around a core of
suitable material. When electric current passes through it, it behaves like a
magnet, its magnetic properties vanish when current is switched off.
In scrap
yard, it is used to separate magnetic junk material.
(1)
The
strength of an electromagnet can be increased by increasing the number of turns
in the coil, increasing magnitude of current and using soft iron core.
It
is based on principle of magnetic effect of current.
(1)
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