The resistance of a strip of copper of rectangular cross section is 2 Ω. A metal of resistivity twice that of a copper is coated on its upper surface to a thickness equal to that of copper strip. The resistance of composite strip will be

Electric Circuits
The resistance of a strip of copper of rectangular cross section is 2 Ω. A metal of resistivity twice that of a copper is coated on its upper surface to a thickness equal to that of copper strip. The resistance of composite strip will be

3 / 4 Ω.

4 / 3 Ω.

3 / 2 Ω.

6 Ω.

3 / 4 Ω.

4 / 3 Ω.

3 / 2 Ω.

6 Ω.

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Electric Circuits
A piece of copper and another piece of germanium are cooled from room temperature to 80K. The resistance of

each of them increases.

copper increases and germanium decreases.

copper decreases and germanium increases.

each of them decreases.

each of them increases.

copper increases and germanium decreases.

copper decreases and germanium increases.

each of them decreases.

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Electric Circuits
A 35 V source is connected to a series circuit of 600 Ω and R as shown. If a voltmeter of internal resistance 1.2 kΩ is connected across 600 Ω resistor, it reads 5 V. The value of R is

2.4 k Ω.

3.6 k Ω.

7.2 k Ω.

1.2 k Ω.

2.4 k Ω.

3.6 k Ω.

7.2 k Ω.

1.2 k Ω.

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Electric Circuits
The current in a chemical cell is a movement of

negative ions only.

positive and negative ions.

positive ions only.

positive hole charges.

negative ions only.

positive and negative ions.

positive ions only.

positive hole charges.

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Electric Circuits
Two electric bulbs have transparent filament of same thickness. It one of them gives 60 W and other gives 100 W, then-

60 W lamp filament has longer length.

100 W lamp filament has longer length.

60 W and 100 W lamp filament have equal length.

60 W lamp filament has shorter length.

60 W lamp filament has longer length.

100 W lamp filament has longer length.

60 W and 100 W lamp filament have equal length.

60 W lamp filament has shorter length.

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Electric Circuits
The energy stored by a capacitor is given by

1/2 CV2.

Q2 / 2C.

all of them.

1/2 QV.

1/2 CV2.

Q2 / 2C.

all of them.

1/2 QV.

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Electric Circuits

Electric Circuits The resistance of a strip of copper of rectangular cross section is 2 Ω. A metal of resistivity twice that of a copper is coated on its upper surface to a thickness equal to that of copper strip. The resistance of composite strip will be

Electric Circuits A piece of copper and another piece of germanium are cooled from room temperature to 80K. The resistance of

Electric Circuits A 35 V source is connected to a series circuit of 600 Ω and R as shown. If a voltmeter of internal resistance 1.2 kΩ is connected across 600 Ω resistor, it reads 5 V. The value of R is

Electric Circuits The current in a chemical cell is a movement of

Electric Circuits Two electric bulbs have transparent filament of same thickness. It one of them gives 60 W and other gives 100 W, then-

Electric Circuits The energy stored by a capacitor is given by

Electric Circuits
The resistance of a strip of copper of rectangular cross section is 2 Ω. A metal of resistivity twice that of a copper is coated on its upper surface to a thickness equal to that of copper strip. The resistance of composite strip will be

Electric Circuits
A piece of copper and another piece of germanium are cooled from room temperature to 80K. The resistance of

Electric Circuits
A 35 V source is connected to a series circuit of 600 Ω and R as shown. If a voltmeter of internal resistance 1.2 kΩ is connected across 600 Ω resistor, it reads 5 V. The value of R is

Electric Circuits
The current in a chemical cell is a movement of

Electric Circuits
Two electric bulbs have transparent filament of same thickness. It one of them gives 60 W and other gives 100 W, then-

Electric Circuits
The energy stored by a capacitor is given by