Specific Resistance and Metre Bridge Concepts

The video tutorial explains how to measure the resistance of a wire using a metre bridge. It begins by defining resistance and outlining the experiment's aim. The necessary materials are listed, followed by detailed instructions on setting up the equipment and performing the experiment. The procedure involves making specific connections, adjusting the resistance box, and measuring distances to find the balancing point. Calculations are then performed to determine the wire's resistance and specific resistance using given formulas.

What is the primary objective of the experiment using a metre bridge?

• To measure the length of a wire

• To find the resistance of a given wire

• To calculate the weight of a wire

• To determine the color of a wire

Which of the following is NOT a material required for the experiment?

• Leclanche cell

• Galvanometer

• Resistance box

• Thermometer

What is the first step in setting up the experiment?

• Connect the galvanometer

• Measure the wire length

• Cut a connecting wire

• Insert the key

Where should the resistance box be introduced in the metre bridge?

• In gap G1

• In gap G2

• At terminal B

• At terminal A

What indicates that the connections are correct when pressing the jockey?

• No deflection in the galvanometer

• Constant deflection

• Deflections in opposite directions

• Deflections in the same direction

How is the mean balancing length calculated?

• l = (l1 + l2) / 2

• l = l1 / l2

• l = l1 - l2

• l = l1 * l2

What is the formula used to calculate the unknown resistance X?

• X = (100 - l) / l * R

• X = R / (100 - l) * l

• X = l / (100 - l) * R

• X = l * (100 - l) / R

What tool is used to measure the radius of the wire?

• Micrometer

• Caliper

• Screw gauge

• Ruler

Which variable represents the length of the wire in the specific resistance formula?

• r

• X

• L

• R

What is the formula for calculating the specific resistance of the wire material?

• ρ = (X L) / (πr^2)

• ρ = (L X) / (πr^2)

• ρ = (πr^2 L) / X

• ρ = (πr^2 X) / L