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qUESTIONS

A 12 cm wire is given a shape of a right angled triangle ABC having sides 3 cm, 4 cm and 5 cm, as shown in the figure. The resistance between two ends (AB, BC, CA) of the respective sides are measured one by one by a multi-meter. The resistances will be in the ratio [2013]

Two rods are joined end to end, as shown. Both have a cross- sectional area of 0.01 cm². Each is 1 meter long. One rod is of copper with a resistivity of 1.7×10^-6 ohm-centimeter, the other is of iron with a resistivity of 10^-5 ohm-centimeter. How much voltage is required to produce a current of 1 ampere in the rods [2013]

Two metal wires of identical dimension are connected in series. If σ1 and σ2 are the conductivities of the metal wires respectively, the effective conductivity of the combination is [2015]

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]

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