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Q. No.The SI unit of current density is:
1.
\(\text{A/m}^3\)
2.
\(\text{A/m}^2\)
3.
\(\text{A/m}\)
4.
\(\text{A-m}\)
Subtopic: Current & Current Density |
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Ohm's law can be re-stated in terms of other quantities (under appropriate assumptions) as:
| 1. | Potential difference = (Current density \(\times\) Resistivity) |
| 2. | Electric field = (Current density \(\times\) Resistivity) |
| 3. | Current density = (Electric field \(\times\) Resistivity) |
| 4. | Current density = (Potential difference \(\times\) Conductivity) |
Subtopic: Derivation of Ohm's Law |
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Given below are two statements:
| Assertion (A): | The electrical resistance of most metallic resistors increases with temperature. |
| Reason (R): | This is mainly due to the increase in their resistivity with temperature. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Derivation of Ohm's Law |
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If two incandescent bulbs, \(50~\text W\) and \(100~\text W,\) are connected in series across the mains then (compared with their original brightness):
| 1. | \(100~\text W\) – glows brighter, \(50~\text W\) – glows dimmer |
| 2. | \(100~\text W\) – glows dimmer, \(50~\text W\) – glows brighter |
| 3. | \(100~\text W,50~\text W\) – both glow brighter |
| 4. | \(100~\text W,50~\text W\) – both glow dimmer |
Subtopic: Heating Effects of Current |
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Kirchhoff's current law (for nodes) is valid:
| 1. | only for steady currents |
| 2. | only for circuits with resistances |
| 3. | only for currents carried by electrons |
| 4. | universally |
Subtopic: Kirchoff's Current Law |
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When the key \(K\) is closed, the currents through the \(3~\Omega\) and \(6~\Omega\) resistors are (respectively):
| 1. | \(1~\text A,2~\text A\) | 2. | \(\text{zero},2~\text A\) |
| 3. | \(\text{zero},1~\text A\) | 4. | \(2~\text A,1~\text A\) |
Subtopic: Kirchoff's Voltage Law |
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The potential difference across the \(2~\Omega\) resistance is:
| 1. | \(6~\text V\) | 2. | \(4~\text V\) |
| 3. | \(2~\text V\) | 4. | \(1~\text V\) |
Subtopic: Kirchoff's Current Law |
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The equivalent resistance between \(A\) and \(B\) is:
| 1. | \(20~\Omega\) | 2. | \(4.8~\Omega\) |
| 3. | \(10~\Omega\) | 4. | \(5~\Omega\) |
Subtopic: Combination of Resistors |
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The equivalent resistance between \(A\) and \(B\) is:
| 1. | \(20~\Omega\) | 2. | \(4.8~\Omega\) |
| 3. | \(10~\Omega\) | 4. | \(5~\Omega\) |
Subtopic: Combination of Resistors |
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Two resistances of \(4~\Omega\) and \(6~\Omega\) are connected in series and potential difference of \(60~\text V\) is applied to the combination.
| Statement I: | The voltage across each resistor is \(60~\text V.\) |
| Statement II: | The current through each resistor is \(6~\text A.\) |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Combination of Resistors |
78%
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