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Centripetal Force

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How does obtaining balance point in the middle of the metre bridge improve the sensitivity??

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Q. Write the principle on which the working of a metre bridge is based. In an experiment on meter bridge, student obtains the balance point at the point

J

A J = 40 c m

, as shown in figure. The values of

R

X

are both doubled and then interchanged. Find the new position of the balance point. If the galvanometer and battery are also interchanged how will the position of balance point be affected

Q. When is the metre bridge most sensitive?

Q. Answer the following :

(a) Why are the connections between the resistors in a meter bridge made of thick copper strips?

(b) Why is it generally preferred to obtain the balance point in the middle of the meter bridge wire?

(c) Which material is used for the meter bridge wire and why?

Q. In a metre bridge a copper coil is connected in the right gap and a resistance of

10 Ω

in the left gap. The balance point is obtained at

0.2 m

. The resistance of the coil is:

Q. (a) Write the principle of working of a metre bridge.
(b) In a metre bridge, the balance point is found at a distance

l_{1}

with resistance R and S as shown in the figure.

An unknown resistance X is now connected in parallel to the resistance S and the balance point is found at a distance

l_{2}

. Obtain a formula for X in terms of

l_{1}, l_{2}

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