A square loop and an electric dipole $\to p$ are fixed on a light plastic plate. The loop caries a current i as shown in the figure. A dipole is at the centre of the loop in the direction shown. Electric and magnetic fields exist in the region such that there is no net torque on the plate due to them. If the magnetic field is in the plane as shown in the figure the electric field must be

Along negative y direction

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Along positive y direction

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Along negative z direction

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Along positive z direction

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Solution

The correct option is C Along negative z direction
Along negative z direction
$\to m \times \to B = - (\to p \times \to E)$
$m (-^k) \times B (^j) = - [p (^j) \times \to E]$
$\to E = E (-^k)$

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The correct option is C Along negative z directionAlong negative z direction →m×→B=−(→p×→E) m(−^k)×B(^j)=−[p(^j)×→E] →E=E(−^k)

The correct option is C Along negative z direction
Along negative z direction
$\to m \times \to B = - (\to p \times \to E)$
$m (-^k) \times B (^j) = - [p (^j) \times \to E]$
$\to E = E (-^k)$