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Question

A student connects a voltmeter, ammeter and resistance according to the circuit given, If the voltmeter reading is 20 V and ammeter reading is 4 A, then the resistance will be :-
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A
equal to 5Ω
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B
more than 5Ω
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C
less than 5Ω
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D
equal to 10Ω
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Solution

The correct option is B more than $$5\:\Omega $$
If voltmeter is not ideal, current $$x$$ will flow through it and ($$4-x$$) current will flow through $$R$$.
Thus, $$R=\dfrac{20}{4-x} > 5$$
current is further reduced due the ammeter connected in series.

Physics

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