Physics

CBSE Class 12

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1.

When electrons drift in a metal from lower to higher potential, does it mean that all the free electrons of the metal are moving in the same direction?

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2.

The horizontal component of the earth’s magnetic field at a place is B and angle of dip is 60°.

What is the value of vertical component of earth’s magnetic field at equator? 2452 Views

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Show on a graph, the variation of resistivity with temperature for a typical semiconductor.

For a semiconductor, resistivity decreases rapidly with increase in temperature.

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5.

Name the physical quantity which remains same for microwaves of wavelength 1 mm and UV radiations of 1600 Å in vacuum.

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6.

Predict the directions of induced currents in metal rings 1 and 2 lying in the same plane where current I in the wire is increasing steadily.

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7.

A cell of emf E and internal resistance r is connected to two external resistances R_{1} and R_{2} and a perfect ammeter. The current in the circuit is measured in four different situations:

(i) without any external resistance in the circuit.

(ii) with resistance R_{1} only

(iii) with R_{1 }and R_{2 }in series combination

(iv) with R_{1 }and R_{2 }in parallel combination.

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8.

The susceptibility of a magnetic material is –2.6 × 10^{–5}. Identify the type of magnetic material and state its two properties.

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9.

Two identical circular wires P and Q each of radius R and carrying current ‘I’ are kept in perpendicular planes such that they have a common center as shown in the figure. Find the magnitude and direction of the net magnetic field at the common center of the two coils.

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10.

When an ideal capacitor is charged by a dc battery, no current flows. However, when an ac source is used, the current flows continuously. How does one explain this, based on the concept of displacement current?

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