Question

when a 14 volt battery is connected across an unknown resistance there is a current of 100 M A in the circuit find the value of the resistance of the resister
a) 5000 ohm
b) 800 ohm
c) 0.8 ohm
d) none of these

Answer 1

d none of the above

Answer 2

Hey mate..
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Given,

Potential Difference of an unknown resistor , V = 40v

Current flowing through the unknown resistor, I = 100 mA

= 100 / 10^-3 A

= 100 / 10000 A

= 1 / 100 A

Resistance of the unknown resistance, R = ?

We know,

V = IR [ By applying Ohm's Law ]

=> V / I = R

=> $\frac{40}{ \frac{1}{100} }$ = R

=> 40 × 100 = R

=> 4000 Ω = R

Thus, The correct option is D) None of the above.

Hope it helps !! ☺