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Q. No.The magnitude and direction of the current in the following circuit is:
| 1. | \(1.5\) A from B to A through E |
| 2. | \(0.2\) A from B to A through E |
| 3. | \(0.5\) A from A to B through E |
| 4. | \(\frac{5}{9}\) A from A to B through E |
Subtopic: Kirchoff's Voltage Law |
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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. \(100~\Omega\)
\(\)
1. \(400~\Omega\)
2. \(200~\Omega\)
3. \(50~\Omega\)
4. \(100~\Omega\)
Subtopic: Kirchoff's Voltage Law |
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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 |
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The resistance of platinum wire at \(0^{\circ} \mathrm{C}\) is \(2~ \Omega\) and \(6.8~ \Omega\) at \(80^{\circ}\). The temperature coefficient of resistance of the wire is:
| 1. | \(3 \times 10^{-1}~{ }^{\circ} \mathrm{C}^{-1}\) | 2. | \(3 \times 10^{-4}~{ }^{\circ} \mathrm{C}^{-1}\) |
| 3. | \(3 \times 10^{-3}~{ }^{\circ} \mathrm{C}^{-1}\) | 4. | \(3 \times 10^{-2}~{ }^{\circ} \mathrm{C}^{-1}\) |
Subtopic: Derivation of Ohm's Law |
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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
1. Germanium
2. Silver
3. Glass
4. Silicon
Subtopic: Current & Current Density |
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A certain wire \(A\) has resistance \(81\) \(\Omega\). The resistance of another wire \(B\) of 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. \(243\) \(\Omega\)
1. \(81\) \(\Omega\)
2. \(9\) \(\Omega\)
3. \(729\) \(\Omega\)
4. \(243\) \(\Omega\)
Subtopic: Derivation of Ohm's Law |
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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 = \(1.6\times10^{-19}~\mathrm{C}\)):
1. \(\frac{6.25\times10^4}{\pi}~\mathrm{ms^{-1}}\)
2. \(\frac{6.25}{\pi}\times10^3~\mathrm{ms^{-1}}\)
3. \(\frac{6.25}{\pi}~\mathrm{ms^{-1}}\)
4. \(\frac{6.25\times10^5}{\pi}~\mathrm{ms^{-1}}\)
1. \(\frac{6.25\times10^4}{\pi}~\mathrm{ms^{-1}}\)
2. \(\frac{6.25}{\pi}\times10^3~\mathrm{ms^{-1}}\)
3. \(\frac{6.25}{\pi}~\mathrm{ms^{-1}}\)
4. \(\frac{6.25\times10^5}{\pi}~\mathrm{ms^{-1}}\)
Subtopic: Current & Current Density |
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The emf of a cell having internal resistance \(1~ \Omega\) is balanced against a length of 330 cm on a potentiometer wire. When an external resistance of \(2 ~\Omega\) is connected across the cell, the balancing length will be:
1. 220 cm
2. 330 cm
3. 115 cm
4. 332 cm
1. 220 cm
2. 330 cm
3. 115 cm
4. 332 cm
Subtopic: Meter Bridge & Potentiometer |
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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. \(1:4\)
1. \(4:1\)
2. \(1:2\)
3. \(2:1\)
4. \(1:4\)
Subtopic: Heating Effects of Current |
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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
1. \(10^{5}\) A/m2
2. \(10^{4}\) A/m2
3. \(10^{6}\) A/m2
4. \(10^{-5}\) A/m2
Subtopic: Current & Current Density |
64%
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NEET - 2022
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