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The coercitivity of a small magnet where the ferromagnet gets demagnetized is 3× 10^3 A/m. The current required to be passed in a solenoid of length 10cm and number of turns 100, so that the magnet gets demagnetized when inside the solenoid , is :
19
Oct
The coercitivity of a small magnet where the ferromagnet gets demagnetized is 3× 10^3 A/m. The current required to be passed in a solenoid of length 10cm and number of turns 100, so that the magnet gets demagnetized when inside the solenoid , is : is so that the magnet gets demagnetized when inside the [...]
Hysteresis loops for two magnetic materials A and B are given below: These materials are used to make magnets for electric generators , transformer core and electromagnet core. Then it is proper to use :
19
Oct
Hysteresis loops for two magnetic materials A and B are given below: These materials are used to make magnets for electric generators , transformer core and electromagnet core. Then it is proper to use : Hysteresis loops for two magnetic materials A and B are given below: These materials are used to make magnets for [...]
A magnetic needle of magnetic moment 6.7 x 10^-2 Am^2 and moment of interia 7.5 x 10^-6 Kg m^2 is performing simple harmonic oscillation in a magnetic field of 0.01 T. time taken for 10 complete oscillation is
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Oct
A magnetic needle of magnetic moment 6.7 x 10^-2 Am^2 and moment of interia 7.5 x 10^-6 Kg m^2 is performing simple harmonic oscillation in a magnetic field of 0.01 T. time taken for 10 complete oscillation is The magnet of a vibration magnetometer is heated so as to reduce its magnetic moment by 36 [...]
Two short bar magnets of length 1 cm each have magnetic moments 1.20 Am^2 and 1.00 Am^2 respectively. They are placed on a horizontal table parallel to each other with their N poles pointing towards the south. They have a common magnetic equator and are separted by a distance of 20.0cm. The value of the resultant horizontal magnetic induction at the mid – point O of the line joining their centres is close to (Horizontal component of earths magnetic induction is 3.6 × 10.5 Wb/m^2
19
Oct
Two short bar magnets of length 1 cm each have magnetic moments 1.20 Am^2 and 1.00 Am^2 respectively. They are placed on a horizontal table parallel to each other with their N poles pointing towards the south. They have a common magnetic equator and are separted by a distance of 20.0cm. The value of the [...]
A small coil C with N = 200 turns is mounted on one end of a balance beam and introduced between the poles of an electromagnet as shown in figure. The cross sectional area of coil is A = 1.0 cm^2, length of arm OA of the balance beam is l = 30 cm. When there is no current in the coil the balance is in equilibrium. On passing a current I = 22 mA through the coil the equilibrium is restored by putting the additional counter weight of mass Δm = 60 mg on the balance pan. Find the magnetic induction at the spot where coil is located.
19
Oct
A small coil C with N = 200 turns is mounted on one end of a balance beam and introduced between the poles of an electromagnet as shown in figure. The cross sectional area of coil is A = 1.0 cm^2, length of arm OA of the balance beam is l = 30 cm. When [...]
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A small coil C with N = 200 turns is mounted on one end of a balance beam and introduced between the poles of an electromagnet as shown in figure. The cross sectional area of coil is A = 1.0 cm^2 ,
The magnet of a vibration magnetometer is heated so as to reduce its magnetic moment by 36 %. By doing this the period time of the magnetometer will ,
A particle A is projected vertically upwards. Another particle B is projected at an angle of 45^∘. Both reach the same height. The ratio of the initial kinetic energy of A to that of B is:
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Oct
A particle A is projected vertically upwards. Another particle B is projected at an angle of 45^∘. Both reach the same height. The ratio of the initial kinetic energy of A to that of B is: A particle A is projected vertically upwards. Another particle B is projected at an angle of 45^∘. Both reach [...]
A particle of mass m is projected from the ground with initial linear momentum p (magnitude) such that to have maximum possible range, its minimum kinetic energy will be
18
Oct
A particle of mass m is projected from the ground with initial linear momentum p (magnitude) such that to have maximum possible range, its minimum kinetic energy will be A particle of mass m is projected from the ground with initial linear momentum p (magnitude) such that to have maximum possible range its minimum kinetic [...]
A particle is projected from the ground with an initial velocity of 20m/s at an angle of 30∘ with horizontal. The magnitude of change in velocity in a time interval from t=0 to t=0.5s (g=10m/s^2)
18
Oct
A particle is projected from the ground with an initial velocity of 20m/s at an angle of 30∘ with horizontal. The magnitude of change in velocity in a time interval from t=0 to t=0.5s (g=10m/s^2) A particle is projected from the ground with an initial velocity of 20m/s at an angle of 30∘ with horizontal. [...]
Velocity of a particle varies with time as v=atiˆ+2ht2jˆ. If the particle starts from point (0,c), the trajectory of the particle is
18
Oct
Velocity of a particle varies with time as v=atiˆ+2ht2jˆ. If the particle starts from point (0,c), the trajectory of the particle is C the trajectory of the particle is Velocity of a particle varies with time as v=atiˆ+2ht2jˆ. If the particle starts from point (0 October 18, 2020 Category: Arihant Physics by D.C Pandey , [...]
A car breaks a traffic signal with a speed of 40m/s. After 2s, a policeman starts following him with a constant acceleration of 12.5m/s^2. Taking the position of signal to be origin, correct position time graph would be
18
Oct
A car breaks a traffic signal with a speed of 40m/s. After 2s, a policeman starts following him with a constant acceleration of 12.5m/s^2. Taking the position of signal to be origin, correct position time graph would be A car breaks a traffic signal with a speed of 40m/s. After 2s a policeman starts following [...]