The magnitude and direction of the current in the following circuit is:

 1 $$1.5~\text{A}$$ from $$\mathrm{B}$$ to $$\mathrm{A}$$ through $$E$$ 2 $$0.2~\text{A}$$ from $$\mathrm{B}$$ to $$\mathrm{A}$$ through $$E$$ 3 $$0.5~\text{A}$$  from $$\mathrm{A}$$ to $$\mathrm{B}$$ through $$E$$ 4 $$\frac{5}{9}~\text{A}$$ from $$\mathrm{A}$$ to $$\mathrm{B}$$ through $$E$$
Subtopic:  Kirchoff's Voltage Law |
70%
From NCERT
NEET - 2023
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If the galvanometer $$\mathrm{G}$$ does not show any deflection in the circuit shown, the value of $$\mathrm{R}$$ is given by:


1. $$400~\Omega$$
2. $$200~\Omega$$
3. $$50~\Omega$$
4. $$100~\Omega$$
Subtopic:  Kirchoff's Voltage Law |
50%
From NCERT
NEET - 2023
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$$10$$ resistors, each of resistance $$R$$ are connected in series to a battery of $$E$$ and negligible internal resistance. Then those are connected in parallel to the same battery, the current is increased $$n$$ times. The value of $$n$$ is:
 1 $$1000$$ 2 $$10$$ 3 $$100$$ 4 $$1$$
Subtopic:  Combination of Resistors |
66%
From NCERT
NEET - 2023
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The resistance of platinum wire at $$0^{\circ} \text{C}$$ is $$2~ \Omega$$ and $$6.8~ \Omega$$ at $$80^{\circ}\text{C}$$. The temperature coefficient of resistance of the wire is:
 1 $$(3\times 10^{-1})^\circ \text{C}^{-1}$$ 2 $$(3 \times 10^{-4})^\circ \text{C}^{-1}$$ 3 $$(3 \times 10^{-3})^\circ \text{C}^{-1}$$ 4 $$(3 \times 10^{-2})^\circ \text{C}^{-1}$$
Subtopic:  Derivation of Ohm's Law |
67%
From NCERT
NEET - 2023
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On the basis of electrical conductivity, which one of the following material has the smallest resistivity?
 1 Germanium 2 Silver 3 Glass 4 Silicon
Subtopic:  Derivation of Ohm's Law |
61%
From NCERT
NEET - 2023
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A certain wire $$A$$ has resistance $$81$$ $$\Omega$$. The resistance of another wire $$B$$ of the same material and equal length but of diameter thrice the diameter of $$A$$ will be:
 1 $$81$$ $$\Omega$$ 2 $$9$$ $$\Omega$$ 3 $$729$$ $$\Omega$$ 4 $$243$$ $$\Omega$$
Subtopic:  Derivation of Ohm's Law |
73%
From NCERT
NEET - 2023
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A copper wire of radius $$1$$ mm contains $$10^{22}$$ free electrons per cubic metre. The drift velocity for free electrons when $$10$$ A current flows through the wire will be:
(Given, charge on electron = $$1.6\times10^{-19}$$ C)
1. $$\frac{6.25\times10^4}{\pi}$$ m/s
2. $$\frac{6.25}{\pi}\times10^3$$ m/s
3. $$\frac{6.25}{\pi}$$ m/s
4. $$\frac{6.25\times10^5}{\pi}$$ m/s
Subtopic:  Current & Current Density |
71%
From NCERT
NEET - 2023
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The emf of a cell having internal resistance $$1~ \Omega$$ is balanced against a length of $$330~\text{cm}$$ on a potentiometer wire. When an external resistance of $$2 ~\Omega$$ is connected across the cell, the balancing length will be:
 1 $$220~\text{cm}$$ 2 $$330~\text{cm}$$ 3 $$115~\text{cm}$$ 4 $$332~\text{cm}$$
Subtopic:  Meter Bridge & Potentiometer |
From NCERT
NEET - 2023
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Two resistors of resistance, $$100$$ $$\Omega$$ and $$200$$ $$\Omega$$ are connected in parallel in an electrical circuit. The ratio of the thermal energy developed in $$100$$ $$\Omega$$ resistor to that in $$200$$ $$\Omega$$ resistor in a given time is:
1. $$4:1$$
2. $$1:2$$
3. $$2:1$$
4. $$1:4$$
Subtopic:  Heating Effects of Current |
68%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
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A copper wire of length $$10$$ m and radius $$\left({10^{-2}/\sqrt{\pi}}\right)$$ m has an electrical resistance of $$10~\Omega.$$ The current density in the wire for an electric field strength of $$10$$ (V/m) is:
1. $$10^{5}$$ A/m2
2. $$10^{4}$$ A/m2
3. $$10^{6}$$ A/m2
4. $$10^{-5}$$ A/m2
Subtopic:  Current & Current Density |
66%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
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Hints
To view explanation, please take trial in the course.
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