Current Electricity questions
395 published questions with worked solutions.
- If a copper wire is stretched to increase its length by 20%. The percentage increase in resistance of the wire is _____________%.
- A uniform metallic wire carries a current 2 A. When 3.4 V battery is connected across it. The mass of uniform metallic wire is...
- With the help of potentiometer, we can determine the value of emf of a given cell. The sensitivity of the potentiometer is (A)...
- If the potential difference between B and D is zero, the value of x is 1 n . The value of n is __________.
- The charge flowing in a conductor changes with time as Q(t) = – t^2+ t^3. Where , and are constants. Minimum value of current is
- In the following circuit, the magnitude of current I_1, is ________A.
- The H amount of thermal energy is developed by a resistor in 10 s when a current of 4 A is passed through it. If the current is...
- The drift velocity of electrons for a conductor connected in an electrical circuit is V_d. The conductor in now replaced by...
- Two identical cells, when connected either in parallel or in series gives same current in an external resistance 5 . The internal...
- A wire when connected to 220 V mains supply has power dissipation P_1. Now the wire is cut into two equal pieces which are...
- The length of a wire of a potentiometer is 100 cm, and the e.m.f. of its standard cell is E volt. It is employed to measure the...
- An ammeter reads upto 1 ampere. Its internal resistance is 0.81ohm. To increase the range to 10 A the value of the required shunt...
- A 220 volt, 1000 watt bulb is connected across a 110 volt mains supply. The power consumed will be
- The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter the change in the...
- The resistance of the series combination of two resistances is S. When they are joined in parallel through total resistance is P....
- An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the length...
- Two sources of equal emf are connected to an external resistance R. The internal resistance of the two sources are R_1 and R_2...
- A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be
- An energy source will supply a constant current into the load of its internal resistance is
- A material ' B ' has twice the specific resistance of ' A '. A circular wire made of ' B ' has twice the diameter of a wire made...
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