JEE Main Physics MCQs - Part 9
Questions 81-90 of 10081. A simple pendulum is suspended from the ceiling of an elevator. If the elevator accelerates upwards with acceleration a, the new time period T' in terms of original period T is:
82. The escape velocity from Earth's surface is v_e. The escape velocity from a point at a height R (radius of Earth) above the surface is:
83. The ratio of escape velocity to orbital velocity (very close to Earth's surface) is:
84. The magnetic field inside an infinitely long solenoid carrying current I with n turns per unit length is:
85. A magnetic dipole of moment M is placed in a uniform magnetic field B at an angle θ. The torque acting on it is:
86. The magnetic susceptibility Ç of a diamagnetic substance is:
87. The displacement current flows in the region where the:
88. The power factor of an LCR series circuit at resonance is:
89. The Q-factor of a resonant LCR circuit is given by:
90. Two rods of the same length and material but different radii râ‚ and râ‚‚ are subjected to the same temperature difference. The ratio of their rates of heat flow is: