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Q. No.A Wheatstone bridge is used to determine the value of unknown resistance by adjusting the variable resistance as shown in the figure. For the most precise measurement of , the resistances and :
| 1. | do not play any significant role. |
| 2. | should be approximately equal to . |
| 3. | should be approximately equal and are small. |
| 4. | should be very large and unequal. |
Subtopic: Wheatstone Bridge |
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In the Wheatstone Bridge arrangement shown, the resistance is The bridge is initially balanced. If P and Q are interchanged: an amount equal to has to be added to to restore the balance. The resistance equals (nearly):
1.
2.
3.
4.
1.
2.
3.
4.
Subtopic: Wheatstone Bridge |
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In a Wheatstone Bridge arrangement, as shown in the figure, the bridge is balanced. However, when the resistances in the arms are switched, the bridge is balanced only when is replaced by in the other two arms. If the value of is , that of is:
| 1. | 2. | ||
| 3. | 4. |
Subtopic: Wheatstone Bridge |
56%
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