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qUESTIONS

MCQs-PYQs-12th-jee

An electron moves on a straight line path XY as shown. The abcd is a coil adjacent to the path of electron. What will be the direction of current if any, induced in the coil

In an aluminium (Al) bar of square cross section, a square hole is drilled and is filled with iron (Fe) as shown in the figure. The electrical resistivities of Al and Fe are 2.7×10^-8 Ωm and 1.0×10^-7 Ωm, respectively. The electrical resistance between the two faces P and Q of the composite bar is [2015]

By increasing the temperature, the specific resistance of a conductor and a semiconductor [2002]

A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of [2003]

The resistance of a conductor is 5 ohm at 50°C and 6 ohm at 100°C. Its resistance at 0°C is [2002]

Two conductors have the same resistance at 0°C but their temperature coefficients of resistance are α₁ and α2. The respective temperature coefficients of their series and parallel combinations are nearly [2010]

In the circuit shown, the current through the 4 Ω resistor is 1 amp when the points P and M are connected to a d.c. voltage source. The potential difference between the points M and N is [2008]

If power dissipated in the 9Ω resistor in the circuit shown is 36 Watt, the potential difference across the 2Ω resistor is [2011]

A battery of emf 10 V and internal resistance 3Ω is connected to a resistor as shown in the figure. If the current in the circuit is 0.5 A, then the resistance of the resistor will be [2013]

A ring is made of a wire having a resistance R0= 12Ω. Find the points A and B as shown in the figure, at which a current carrying conductor should be connected so that the resistance R of the sub circuit between these points is equal to 8/3 Ω [2012]

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