KCET 2017 | Current Electricity Question 54 | Physics

A galvanometer of resistance $50 \Omega$ is connected to a battery of $3 \cdot \mathrm{~V}$ along with a${ }^{\text { }}$ resistance of $2950 \Omega$ in series shows full-scale deflection of 30 divisions. The additional series resistance required to reduce the deflection to 20 divisions is

$2950 \Omega$

$1500 \Omega$

$4440 \Omega$

$7400 \Omega$

KCET 2017

MCQ (Single Correct Answer)

-0

A cylindrical conductor of diameter 0.1 mm carries a current of 90 mA . The current density ( in $\mathrm{Am}^{-2}$ ) is ( $\pi \approx 3$ )

$1.2 \times 10^7$

$3 \times 10^6$

$6 \times 10^6$

$2.4 \times 10^7$

KCET 2017

MCQ (Single Correct Answer)

-0

A piece of copper is to be shaped into a conducting wire of maximum resistance. The suitable length and diameter are ......................and............................respectively.

$2 L$ and $d / 2$

$L / 2$ and $2 d$

Landd

$2 L$ and $d$

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