Drift velocity Quiz 1

Question 1

The radius of a circular metallic rod is $$'r'$$ and its length is $$'L '$$. It acts as a conducting medium, allowing current to flow through it. What is the new resistance given by the circuit if the radius becomes $$\dfrac{1}{n}$$ times the initial radius by stretching the metal wire? Given  that the initial resistance is $$'R'$$ and the resistivity is $$'\rho'$$.

Accepted Answer

$${{n}^{4}}R$$

Answer

$$nR$$

Answer

$${{n}^{2}}R$$

Answer

$${{n}^{3}}R$$

Question 2

There are $$2	imes {{10}^{20}}$$ electrons in a given cylindrical conductor. A current $$1	ext{ A}$$ flows along the cylinder with a radius of $$1	ext{ cm}$$. The electrons' drift velocity $${{v}_{d}}$$ will be calculated.

Accepted Answer

$$100\,	ext{m/s}$$

Answer

$$110\,	ext{m/s}$$

Answer

$$210\,	ext{m/s}$$

Answer

$$200\,	ext{m/s}$$

Question 3

The flow of current in a cylindrical conducting shell is a function of time as $$3+2t$$. The number of charge carriers moving through this shell in a $$1$$ to $$4$$ second time interval will be determined.

Accepted Answer

$$24\,C$$

Answer

$$20\,C$$

Answer

$$25\,C$$

Answer

$$22\,C$$

Question 4

A cylindrical solid conductor connected to a battery of $$emf\,'E'$$. $$I$$ is the amount of current  flowing  through it, and if a resistance of $$5\,\Omega $$ is connected in series to the cylinder,  the drift velocity will-

Accepted Answer

decrease

Answer

increase

Answer

Remain same

Answer

None of these

Question 5

Find the potential drop in volts across $$5\Omega $$ resistor and the current in Amperes, flowing through the circuit?<img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/6dc02d6f-8555-4773-b243-02ac6e3cb3a01490783625468968377.png"/>

Accepted Answer

$$\dfrac{25}{3},\dfrac{5}{3}$$

Answer

$$\dfrac{5}{3},\dfrac{5}{3}$$

Answer

$$\dfrac{25}{3},\dfrac{10}{3}$$

Answer

$$\dfrac{25}{3},\dfrac{7}{3}$$