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qUESTIONS

Three resistance P, Q, R each of 2Ω and an unknown resistance S form the four arms of a Wheatstone bridge circuit. When a resistance of 6Ω is connected in parallel to S the bridge gets balanced. What is the value of S [2007]

In the circuit shown, if a conducting wire is connected between points A and B, the current in this wire will [2006]

In the circuit shown in figure, the current drawn from the battery is 4A. If 10 Ω resistor is replaced by 20 Ω resistor, then current drawn from the circuit will be [2001]

Five equal resistances each of resistance R are connected as shown in the figure. A battery of V volts is connected between A and B. The current flowing in AFCEB will be [2004]

Express which of the following setups can be used to verify Ohm’s law [2003]

If the ratio of the concentration of electron to that of holes in a semiconductor is 7/5 and the ratio of current is 7/4, then what is the ratio of their drift velocities [2006]

When 5V potential difference is applied across a wire of length 0.1m, the drift speed of electrons is 2.5×104 ms¯¹. If the electron density in the wire is 8×10^28m³, the resistivity of the material is close to [2015]

If a wire is stretched to make it 0.1% longer, its resistance will [2011]

A material ‘B’ has twice the specific resistance of ‘A’. A circular wire made of ‘B’ has twice the diameter of a wire made of ‘A’. Then for the two wires to have the same resistance, the ratio lB/lA of their respective lengths must be [2006]

The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter the change in the resistance of the wire will be [2018]

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