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An ammeter is connected in series with a...

An ammeter is connected in series with an unknown resistance and a voltmeter is connected across the terminals of the resistance . If the ammeter reads 1.2 A and the voltmeter reads 18 V the n value of the resistance is

A

`21 . 6`

B

`18 . 0`

C

`15 . 0`

D

`9 . 0`

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The correct Answer is:
C
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