Meter Bridge

Q. In a metre bridge, the gaps are closed by resistances $P$ and $Q$, $P$ being less than $Q$. A balance is obtained when the jockey makes contact at a point of bridge wire $40\text{cm}$ from one end. On shunting the coil $Q$ with a resistance of $50\Omega$, the balance point is moved through $10\text{cm}$. The resistance $P$ and $Q$ are

1. $25\Omega ,16.67\Omega$
2. $16.67\Omega ,25\Omega$
3. $10\Omega ,25\Omega$
4. $8\Omega ,12\Omega$

Q. In a metre bridge experiment with resistance $R_1$ in the left gap and a resistance S in the right gap, balance point is obtained at 40 cm from zero end. With another resistance $R_2$ in left gap with same S in right gap, the balance point is obtained at 50 cm. If $R_1$ and $R_2$ are put in parallel in the left gap without changing S, the balancing length will be

1. 28.5 cm
2. 32.5 cm
3. 82.5 cm
4. 42.5 cm

Q. On interchanging, the resistances, the balance point of a meter bridge shifts to left by $10\text{cm}$. The resistance of their series combination is $1k\Omega$. How much was the resistance on the left slot before interchanging the resistances?

1. $910\Omega$
2. $990\Omega$
3. $505\Omega$
4. $550\Omega$

Q. Two equal resistances are connected in the gaps of a metre bridge. If the resistance in the left gap is increased by $10\%$ the balancing point shifts by

1. $10\%$ to right
2. $10\%$ to left
3. $9.6\%$ to right
4. $4.8\%$ to right

Q. In a meter bridge, the gaps are closed by two resistances P and Q and the balance point is obtained at 40 cm.When Q is shunted by a resistance of $15\Omega$, the balance point shifts to 66.67 cm. The values of P and Q are

1. $20\Omega ,30\Omega$
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2. $10\Omega ,15\Omega$
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3. $5\Omega ,7.5\Omega$
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4. $\frac{10}{3}\Omega ,5\Omega$
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Q. In meter bridge the balancing length from left and when standard resistance of $1\Omega$ is in right gap is found to be 20 cm. The value of unknown resistance is

1. $0.25\Omega$
2. $0.4\Omega$
3. $0.5\Omega$
4. $4\Omega$