Physics-
General
Easy
Question
Two coils are placed close to each other as shown in the figure. When the key K is pressed a current flows in the secondary coil abcd. What happens on breaking the circuit?
- No current flows in the coils S
- A current greater in magnitude but same in direction flows through the coil
- The magnitude of the current is greater but direction is reversed
- The magnitude of the current is lower and direction is reversed
The correct answer is: The magnitude of the current is greater but direction is reversed
Conceptual
Related Questions to study
Physics-
A small piece of substance is repelled by a strong permanent magnet. The substance is
A small piece of substance is repelled by a strong permanent magnet. The substance is
Physics-General
Physics-
What is the magnetic field at the center of circular loop in the circuit shown below? The wires crossing at P are insulated from each other.
What is the magnetic field at the center of circular loop in the circuit shown below? The wires crossing at P are insulated from each other.
Physics-General
Physics-
A rectangular loop carries a current Io. It is placed near a long straight conductor carrying current I as shown in figure. What will be the nature of the force experienced by the coil?
A rectangular loop carries a current Io. It is placed near a long straight conductor carrying current I as shown in figure. What will be the nature of the force experienced by the coil?
Physics-General
Physics-
Figure shows three parallel wires carrying currents as shown. The force on the wire b is
Figure shows three parallel wires carrying currents as shown. The force on the wire b is
Physics-General
Physics-
A circular coil is kept as shown in the figure horizontally. If a magnet falls freely from the above then the magnitude of induced current in the coil is
A circular coil is kept as shown in the figure horizontally. If a magnet falls freely from the above then the magnitude of induced current in the coil is
Physics-General
Physics-
An infinite straight current carrying conductor is bent into a circle as shown in the figure. If the radius of the circle is R, the magnetic field at the center of the coil is
An infinite straight current carrying conductor is bent into a circle as shown in the figure. If the radius of the circle is R, the magnetic field at the center of the coil is
Physics-General
Physics-
ABCDEF is a regular hexagon. What is the value of 
ABCDEF is a regular hexagon. What is the value of
Physics-General
Physics-
The resultant of the three vectors 
shown in figure.
The resultant of the three vectors shown in figure.
Physics-General
Physics-
In the figure, 
equals
In the figure, equals
Physics-General
Physics-
Elastic waves in solid are:
Elastic waves in solid are:
Physics-General
Physics-
The magnetic field at a distance r from a long wire carrying current I is 0.4 tesla. The magnetic field at a distance 2r is
The magnetic field at a distance r from a long wire carrying current I is 0.4 tesla. The magnetic field at a distance 2r is
Physics-General
Physics-
How much heat energy is gained when 5 kg of water at 20oC is brought to its boiling point (Specific heat of water = 4.2 kJ kg-1c-1)
How much heat energy is gained when 5 kg of water at 20oC is brought to its boiling point (Specific heat of water = 4.2 kJ kg-1c-1)
Physics-General
Physics-
Absolute zero (OK) is that temperature at which
Absolute zero (OK) is that temperature at which
Physics-General
Physics-
The value of 
is
The value of is
Physics-General
Physics-
A force of 50 N acts on the block at the angle shown in the diagram. The block moves a horizontal distance of 3.0 m. Then the work done by this force
A force of 50 N acts on the block at the angle shown in the diagram. The block moves a horizontal distance of 3.0 m. Then the work done by this force
Physics-General
