Physics-
General
Easy
Question
In a wire of circular cross-section with radius ' r ' free electrons travel with a drift velocity v, when a current I flows through the wire. The current in another wire of half the radius and of the same material when the drift velocity is 2 V
- 2I
- I
The correct answer is:
Related Questions to study
Physics-
In the circuit shown, a voltmeter of internal resistance ' R ' when connected across B and C, reads 
volts. Neglecting the internal resistance of the cell, the value of ' R ' is
In the circuit shown, a voltmeter of internal resistance ' R ' when connected across B and C, reads volts. Neglecting the internal resistance of the cell, the value of ' R ' is
Physics-General
Physics-
A 5 V battery with internal resistance 2 W and a 2 V battery with internal resistance 1 W are connected to as 10 W resister as shown in the figure The current in the 
resistor is
A 5 V battery with internal resistance 2 W and a 2 V battery with internal resistance 1 W are connected to as 10 W resister as shown in the figure The current in the resistor is
Physics-General
Physics-
Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer.
Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer.
Physics-General
Physics-
A current of 2A flows in an electric circuit as shown in figure. The potential difference 
, in volts 
and 
)are potentials at R and S respectively) is
A current of 2A flows in an electric circuit as shown in figure. The potential difference , in volts and )are potentials at R and S respectively) is
Physics-General
Physics-
I and V are respectively the current and voltage in a metal wire of resistance 'R'. Two I- V graphs at two different temperatures 
and 
are given in the graph. Then,
I and V are respectively the current and voltage in a metal wire of resistance 'R'. Two I- V graphs at two different temperatures and are given in the graph. Then,
Physics-General
Physics-
If the current in a heater increases by 10%, the percentage change in the power consumption
If the current in a heater increases by 10%, the percentage change in the power consumption
Physics-General
Physics-
Unit of magnetic moment is ..........
Unit of magnetic moment is ..........
Physics-General
Physics-
When a bar magnet of pole strength m is cut into equal halves, parallel to its axis the pole strength of each piece is
When a bar magnet of pole strength m is cut into equal halves, parallel to its axis the pole strength of each piece is
Physics-General
Physics-
............ poles appear at the point of separation
............ poles appear at the point of separation
Physics-General
Physics-
Shape of Horseshoe magnet is _______
Shape of Horseshoe magnet is _______
Physics-General
Physics-
Magnet used in electric motors is
Magnet used in electric motors is
Physics-General
Physics-
The substances with density less than ________, float in water
The substances with density less than ________, float in water
Physics-General
Physics-
One century is equal to how many years?
One century is equal to how many years?
Physics-General
Physics-
One millennium is equal to how many decades?
One millennium is equal to how many decades?
Physics-General
Physics-
1 minute = _______________ seconds.
1 minute = _______________ seconds.
Physics-General
