MCQ
Which resistor has color bands on it?
- ✓Carbon resistor.
- BRheostat.
- CWire wound resistor.
- DNone of these.
The carbon composition resistor is a type of fixed resistor that reduces or restricts the electric current flow to a certain level.

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The ratio of the radii of trajectory of proton to that of $\alpha$ -particle is $2: 1 .$ The ratio of $K _{ p }: K _{\alpha}$ is :