d) +0.55 A 160 12 V 13. A resistor carries a current I. The power dissipated in

Question

d) +0.55 A 160 12 V 13. A resistor carries a current I. The power dissipated in the resistor is P. What is the power dissipated if the same resistor carries current 3? a) p b) 3P c) P/3 d) 9P 14. A long straight wire parallel to the y axis carries a current of 6.3 A in the positive y direction. There is a uniform magnetic field -1.5 T along x-axis . The force per unit length on the wire is: a) 6.3 N/mm b) 9.5 N/m c) -6.3 N/m d) -9.5 N/m 15. A circular current loop lies in the xy plane and has radius R 10 cm. The loop has 20 turns 5

Explanation / Answer

13. Correct Option is 'D'

use P = I2R
current goes up by 3, and I2goes up by 9.

14. Correct Option is 'B'

F = I.LXB

Force per unit length = F/L = IB (since they are perpendicular)

Using I = 6.5 A and B = 1.5 T. we get the result.

16. Correct Option is 'B'  

Positive plate produces field away from it.

When a positive charge moves opposite to the direction of the

electric fileld, the field does negative work on it and the potential energy increases.

Thank you

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