MCQ
An electric dipole placed in a non$-$uniform electric field can experience:
- AA force but not a torque.
- BA torque but not a force.
- ✓Always a force and a torque.
- DNeither a force nor a torque.

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$I$. All isotopes of an element have the same number of neutrons.
$II$. Only one isotope of an element can be stable and non-radioactive.
$III$. All elements have isotopes.
$IV$. All isotopes of carbon can form chemical compounds with oxygen-$16$.
Choose the correct option regarding an isotope.