A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by ( 60 ^ { \circ } ) is W . Now the torque required to keep the magnet in this new position is

Photons with energy 5 eV are incident on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectr…

The interference pattern is obtained with two coherent light sources of intensity ratio \( n \). In the interference pa…

A parallel- plate capacitor of area \( A \), plate separation \( d \) and capacitance \( C \) is filled with four diele…

An electric dipole is placed at an angle of \( 30 ^ { \circ } \) with an electric field intensity \( 2 \times 10 ^ { 5…

The temperature inside a refrigerator is \( t { 2 } { } ^ { \circ } \mathrm { C } \) and the room temperature is \( \ma…

Two rotating bodies \( A \) and \( B \) of masses \( m \) and \( 2 m \) with moments of inertia \( I { A } \) and \( I…

A bullet of mass 10 g moving horizontally with a velocity of \( 400 \mathrm{m} \mathrm{s}^{-1} \) strikes a wooden bloc…

The highest DDT concentration in aquatic food chain shall occur in

A lake which is rich in organic waste may result in

Match Column-I with Column-II and select the correct option using the codes given below: \begin{tabular} { | l | l | }…