Two small bar magnets are placed in a line at certain distance d apart. If length of each magnet is negligible compared to d, the force between them will be inversely proportional to

Question:

Options :

(a) d
(b) d²
(c)1/d²
(d) d^4

Answer :

Ans :-(d) d⁴

Answer Steps :

Step 1:-

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Forty electric bulbs are connected in series across a 220 V supply. After one bulb is fused, the remaining 39 are connected again in series across the same supply. The illumination will be

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