Physics

Problem

Young's moduli of two wires A and B are in the ratio

7 : 4

. Wire A is

2 \text{ m}

long and has radius

R

. Wire B is

1.5 \text{ m}

long and has radius

2 \text{ mm}

. If the two wires stretch by the same length for a given load, then the value of

R

is close to : a.

1.5 \text{ mm}

1.9 \text{ mm}

1.7 \text{ mm}

1.3 \text{ mm}