Question

when the torque on an electric dipole placed in a uniform electric field is
1)zero
2)maximum
3)half of maximum value

Answer 1

HOPE IT HELPS :

Torque on an electric dipole placed in a uniform Electric  Field :

Since we know that Torque is given by :

$T = PEsin\alpha$

i ) Zero :

When $\alpha = 0$ Dipole may be parallel or anti-parallel to electric fields .

ii) Maximum :

When $\alpha = 90$, Dipole perpendicular to electric Field lines .

iii) Half of the maximum :

When $\alpha = 30^{o}$  

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