Measurement and Instrumentation
In figure Z1 = 200∠60° ohm. Z2 = 400∠-90° ohm, Z3 = 300∠0° ohm. Then Z4 for bridge to be balanced is

 150∠30° ohm.
 400∠-90° ohm.
 300∠90° ohm.
 600∠-150° ohm.

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Measurement and Instrumentation
A resistance of 105 ohms is specified using significant figures as indicated below : 1. 105 ohms 2. 105.0 ohms 3. 0.000105 mega ohms Among these,

 1, 2 and 3 represent same precision.
 2 represents greater precision but 1 and 3 represent same precision.
 1 represents greater precision than 2 and 3.
 2 and 3 represent greater precision than 1.

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