Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Please check your email for login details.
MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping

a long straight wire is fixed horizontally and carries a current of 50A.... a second wire having linear mass density of 1X10^-4kg/m......is placed parallel and above the first wire at a separation of 5mm.....what current must be flowing in the second wire such that the magnetic repulsion can balance its weight....??? PLS ANSWER....>ELABORATE iT SHOWING THE WORKING AND THE LOGIC...... ANSWER WILLL SURELY BE APPROVED.......!!

a long straight wire is fixed horizontally and carries a current of 50A....  a second wire having linear mass density of 1X10^-4kg/m......is placed parallel and above the first wire  at a separation of 5mm.....what current must be flowing in the second wire such that the magnetic repulsion can balance its weight....???


PLS ANSWER....>ELABORATE iT SHOWING THE WORKING AND THE LOGIC......


ANSWER WILLL SURELY BE APPROVED.......!! 

Grade:9

2 Answers

Roshan Mohanty
64 Points
9 years ago

First concentrate at the lower wire..
magnetic field due to it will be  B=u.I/2*pie*d(where u=4pie * 10^-7 SI,d=5*10^-3 m)------Biot Savarts Law(i)
 force on the upper wire will be F=I(L X B)
L=length of the upper wire and B is the magnetic field
force will be in upward direction
so F should be equal to mg
F=mg
ILB=10^-4 * L * g
=>IB=10^-4 * g
=>I*(u.I/2*pie*d)=10^-4 * g-------From (i)
so from here u can easily find I(current)
*If you hav any doubt in the procedure..do tell
*Thank You

Kushal Patel
13 Points
4 years ago
Here,the following force balance existsmagnetic repulsive force between the two wires per unit length = weight per unit length of one wire orμ0I1.I2 / 2πx = W/ = (m/L).gso,current on wire 2I2 = [2πx (m/L).g] / μ0I1we havex = 5mm = 0.005mm/L = 10-4 kg/mI1 = 50 Aso,I2 = [2 x 3.14 x (10-4) x 9.81] / 2x10-7 x 50thus, by solving, we getI2 = 30.77 A

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

ASK QUESTION

Get your questions answered by the expert for free