A 50 ohm galvanometer gets full scale deflection when a current of 0.01 A passes through the coil. When it is converted into a 10 A ammeter, the shunt resistance is
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(a) […]
A DC ammeter has resistance 0.1Ω and its current ranges 0-100A. If the range is to be extended to 1-500, then the following shunt resistance will be required
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(a) 0.010Ω (b) 0.011Ω […]
A current of 5 A is passing through a metallic wire of cross-sectional area 4×10⁻⁶ m². If the density of charge carriers of the wire is 5×10²⁶ m⁻³, the drift velocity of the electrons will […]
A 36 Ω galvanometer is shunted by resistance of 4 Ω. The percentage of the total current, which passes through the galvanometer is
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(a) 8% (b) 9% (c) 10% (d) 91%
Correct […]
Three resistances 2Ω, 3Ω and 4Ω are connected in parallel. The ratio of currents passing through them when a potential difference is applied across its ends will be
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(a) (5:4:3) (b) (6:3:2) […]
A metal plate weighing 750g is to be electroplated with 0.05% of its weight of silver. If a current of 0.8A is used, find the time (approx) needed for depositing the required weight of silver […]
A 1Ω resistance in series with an ammeter is balanced by 75 cm of potentiometer wire. A standard cell of emf 1.02 V is balanced by 50 cm. The ammeter shows a reading of 1.5A. […]
A certain current on passing through a galvanometer produces a deflection of 100 divisions. When a shunt of one ohm is connected, the deflection reduces to division. The galvanometer resistance is
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(a) […]
A 1m long wire of diameter 0.31 mm has a resistance of 4.2Ω. If it is replaced by another wire of same material of length 1.5m and diameter 0.155 mm, then the resistance of wire […]
6Ω and 12Ω resistors are connected in parallel. This combination is connected in series with a 10 V battery and 6Ω resistor. What is the potential difference between the terminals of the 12Ω resistor?
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