Consider a rectangular slab of length and area of cross section A current is passed through it. If the length is doubled, the potential drop across the end faces |
|||

a) |
Becomes half of the initial value |
b) |
Becomes one-fourth of the initial value |

c) |
Becomes double the initial value |
d) |
Remains same |

Consider a rectangular slab of length and area of cross section A current is passed through it. If the length is doubled, the potential drop across the end faces |
|||

a) |
Becomes half of the initial value |
b) |
Becomes one-fourth of the initial value |

c) |
Becomes double the initial value |
d) |
Remains same |

1 Answer

127 votes

**(c)**

Resistance of the slab where

The potential across is

The length of the slab is doubled. Therefore the resistance is Assuming that the same current is passed, the potential across the new resistance is

127 votes

127