Two blocks of masses \( m_{1} \) and \( m_{2} \) are placed in contact with each other on a hori...

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Two blocks of masses \( m_{1} \) and \( m_{2} \) are placed in contact with each other on a horizontal platform as shown in figure. The coefficient of friction between \( m_{1} \) and platform is \( 2 \mu \) and that between block \( m_{2} \) and platform is \( \mu \). The platform moves with an acceleration a. The normal reaction between the block is
(a) Zero in all cases
(b) Zero only if \( m_{1}=m_{2} \)
(c) Non zero only if \( a2 \mu g \)
(d) Non zero only if \( a\mu g \)
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