Understanding Equivalent Resistance in Series

What is the purpose of removing the key during the initial setup of the metre bridge?

• To ensure the resistance box is properly connected

• To allow the galvanometer to calibrate

• To prevent current flow before the setup is complete

• To check the battery voltage

Why is it important to ensure the resistance wire just touches the terminal in the metre bridge?

• To ensure accurate resistance measurement

• To prevent the wire from overheating

• To avoid short-circuiting the setup

• To allow the galvanometer to function properly

What is the balancing length measured from end A when using resistance wire r1?

• 60 cm

• 45 cm

• 50 cm

• 55.5 cm

What is the balancing length measured from end A when using resistance wire r2?

• 55.5 cm

• 52.5 cm

• 57 cm

• 50 cm

When r1 and r2 are connected in series, what is the balancing length measured from end A?

• 30.7 cm

• 35.7 cm

• 40.7 cm

• 45.7 cm