Current Electricity questions
395 published questions with worked solutions.
- A heating filament and an ideal resistor of fixed value are connected in series with a DC voltage source. After some time, the...
- (A) The drift velocity of electrons decreases with the increase in the temperature of conductor. (B) The drift velocity is...
- The current density in a cylindrical wire of radius r = 4.0 mm is 1.0 10^ 6 A/m^ 2 . The current through the outer portion of the...
- The current density in a cylindrical wire of radius 4 mm is 4 10^ 6 Am^ -2 . The current through the outer portion of the wire...
- Given below are two statements: Statement I : A uniform wire of resistance 80 is cut into four equal parts. These parts are now...
- An electrical bulb rated 220 V, 100 W, is connected in series with another bulb rated 220 V, 60 W. If the voltage across...
- Two metallic wires of identical dimensions are connected is series. If _ 1 and _ 2 are the conductivities of the these wires...
- The combination of two identical cells, whether connected in series or parallel combination provides the same current through an...
- The length of a metallic wire is increased by 20% and its area of cross section is reduced by 4%. The percentage change in...
- The number density of free electrons in copper is nearly 8 10^ 28 m^ -3 . A copper wire has its area of cross section = 2 10^ -6...
- A current of 2 A flows through a wire of cross sectional area 25.0 mm^2. The number of free electrons in a cubic meter are 2.0...
- A rectangular parallelopiped is measured as 1 cm × 1 cm × 100 cm. If its specific resistance is 3 10^ -7 , then the resistance...
- 10 resistors each of resistance 10 can be connected in such as to get maximum and minimum equivalent resistance. The ratio of...
- Two identical cells each of emf 1.5 V are connected in series across a 10 resistance. An ideal voltmeter connected across 10...
- The current sensitivity of moving coil galvanometer is increased by 25%. This increase is achieved only changing in the number of...
- A wire of resistance 160 is melted and drawn in a wire of one-fourth of its length. The new resistance of the wire will be
- A potential V_0 is applied across a uniform wire of resistance R. The power dissipation is P_1. The wire then cut into two equal...
- Given below are two statements: Statement I : The equivalent resistance of resistors in a series combination is smaller than...
- In the given circuit, the current (I) through the battery will be
- A cell of emf 90 V is connected across series combination of two resistors each of 100 resistance. A voltmeter of resistance 400...
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