JEE Mains Physics 2002-2019 Solved Video Solutions
In a meter bridge experiment S is a standard resistance. R is a resistance wire. It Is found that balancing length is l = 25 cm. If R is replaced by a wire of half length and half diameter that of R of same material, then the balancing distance l’ (in cm) will now be________.
23
Sep
In a meter bridge experiment S is a standard resistance. R is a resistance wire. It Is found that balancing length is l = 25 cm. If R is replaced by a wire of half length and half diameter that of R of same material, then the balancing distance l’ (in cm) will now be________. [...]
The circuit shown below is working as a 8 V dc regulated voltage source. When 12 V is used as input, the power dissipated (in mW) in each diode is; (considering both Zener diodes are identical) _________.
23
Sep
The circuit shown below is working as a 8 V dc regulated voltage source. When 12 V is used as input, the power dissipated (in mW) in each diode is; (considering both Zener diodes are identical) _________. The circuit shown below is working as a 8 V dc regulated voltage source. When 12 V is [...]
A uniformly thick wheel with moment of inertia I and radius R is free to rotate about its centre of mass (see fig). A massless string is wrapped over its rim and two blocks of masses m1 and m2(m1 > m2) are attached to the ends of the string. The system is released from rest. The angular speed of the wheel when m1 descents by a distance h is :
23
Sep
A uniformly thick wheel with moment of inertia I and radius R is free to rotate about its centre of mass (see fig). A massless string is wrapped over its rim and two blocks of masses m1 and m2(m1 > m2) are attached to the ends of the string. The system is released from rest. [...]
A particle starts from the origin at t = 0 with an initial velocity of 3.0 i m/s and moves in the x-y plane with a constant acceleration (6.0i + 4.0j)m/s^2. The x-coordinate of the particle at the instant when its y-coordinate is 32 m is D meters. The value of D is
23
Sep
A particle starts from the origin at t = 0 with an initial velocity of 3.0 i m/s and moves in the x-y plane with a constant acceleration (6.0i + 4.0j)m/s^2. The x-coordinate of the particle at the instant when its y-coordinate is 32 m is D meters. The value of D is Which of [...]
A spring mass system (mass m, spring constant k and natural length l) rest in equilibrium on a horizontal disc. The free end of the spring is fixed at the centre of the disc. If the disc together with spring mass system, rotates about it’s axis with an angular velocity ω, (k >> mω^2) the relative change in the length of the spring is best given by the option :
23
Sep
A spring mass system (mass m, spring constant k and natural length l) rest in equilibrium on a horizontal disc. The free end of the spring is fixed at the centre of the disc. If the disc together with spring mass system, rotates about it’s axis with an angular velocity ω, (k >> mω^2) the [...]
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(k >> mω^2) the relative change in the length of the spring is best given by the option : ,
A spring mass system (mass m ,
rotates about it's axis with an angular velocity ω ,
spring constant k and natural length l) rest in equilibrium on a horizontal disc. The free end of the spring is fixed at the centre of the disc. If the disc together with spring mass system ,
There is a small source of light at some depth below the surface of water (refractive index = 4/3) in a tank of large cross sectional surface area. Neglecting any reflection from the bottom and absorption by water, percentage of light that emerges out of surface is (nearly) : [Use the fact that surface area of a spherical cap of height h and radius of curvature r is 2 πrh]:
23
Sep
There is a small source of light at some depth below the surface of water (refractive index = 4/3) in a tank of large cross sectional surface area. Neglecting any reflection from the bottom and absorption by water, percentage of light that emerges out of surface is (nearly) : [Use the fact that surface area [...]
A small circular loop of conducting wire has radius a and carries current I. It is placed in a uniform magnetic field B perpendicular to its plane such that when rotated slightly about its diameter and released, it starts performing simple harmonic motion of time period T. If the mass of the loop is m then :
23
Sep
A small circular loop of conducting wire has radius a and carries current I. It is placed in a uniform magnetic field B perpendicular to its plane such that when rotated slightly about its diameter and released, it starts performing simple harmonic motion of time period T. If the mass of the loop is m [...]
An electron gun is placed inside a long solenoid of radius R on its axis. The solenoid has n turns/length and carries a current I. The electron gun shoots an electron along the radius of the solenoid with speed v. If the electron does not hit the surface of the solenoid, maximum possible value of v is (all symbols have their standard meaning) :
23
Sep
An electron gun is placed inside a long solenoid of radius R on its axis. The solenoid has n turns/length and carries a current I. The electron gun shoots an electron along the radius of the solenoid with speed v. If the electron does not hit the surface of the solenoid, maximum possible value of [...]
A plane electromagnetic wave is propagating along the direction (i + j)/√2, with its polarization along the direction k. The correct form of the magnetic field of the wave would be (here B0 is an appropriate constant) :
23
Sep
A plane electromagnetic wave is propagating along the direction (i + j)/√2, with its polarization along the direction k. The correct form of the magnetic field of the wave would be (here B0 is an appropriate constant) : A plane electromagnetic wave is propagating along the direction (i + j)/√2 with its polarization along the [...]
In LC circuit the inductance L = 40 mH and capacitance C = 100 µF. If a voltage V(t) = 10 sin(314 t) is applied to the circuit, the current in the circuit is given as :
23
Sep
In LC circuit the inductance L = 40 mH and capacitance C = 100 µF. If a voltage V(t) = 10 sin(314 t) is applied to the circuit, the current in the circuit is given as : In LC circuit the inductance L = 40 mH and capacitance C = 100 µF. If a voltage [...]