MCQ
An emf can be induced in stationary coil if it is kept in
- AStationary uniform magnetic field
- BStationary nonuniform magnetic field
- ✓Time varying magnetic field
- DNot possible
Time varying $\bar{B}$ will induce emf as
$\varepsilon=-\frac{d \phi}{d t}$
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$(i)$ Gravitational force with time
$(ii)$ Viscous force with time
$(iii)$ Net force acting on the ball with time

$(i)$ an equilateral triangle of side $'a'.$
$(ii)$ a square of side $'a'.$
The magnetic dipole moments of the coil in each case respectively are:
